water espm 2 2015 - uc berkeley college of natural...
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ESPM 2 The Biosphere
WATER & the Biosphere, ESPM 2
Water
Dennis BaldocchiESPM 2, The Biosphere
University of California, BerkeleyFall, 2015
Liquid Solid Gaseous
11/13/2015
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ESPM 2 The Biosphere
Water, water, every where,And all the boards did shrink ;Water, water, every where,Nor any drop to drink.
Rime of the Ancient Mariner, Samuel Coleridge
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Outline
• Physical properties• Water at cell level
– Water potential• Water at Plant level
– Adhesion Cohesion theory– Transpiration– Hydraulic lift
• Water at Ecosystem/Watershed Level– Evaporation
• Water Balance at Continental/Global Level
ESPM 2 The Biosphere
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Water, Life and the Biosphere
• Water is a highly effective solvent for salts, sugars, gases, acids and alkalis
• It is transport medium for nutrients to cells• Provides turgidity for cell growth and expansion
• It provides electrons in photochemical reactions that lead to carbon reduction
• Plays role in weathering rock and forming soil
ESPM 2 The Biosphere
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Biometeorology, ESPM 129
Property Value
molecular weight 18 g mole‐1
melting point 273.15 K
boiling point 373.15 K
latent heat of vaporization
2.442 MJ kg‐1 or 44.00 kJ mol‐1at 20 C
latent heat of sublimation
2.826 MJ kg‐1 or 51.0 kJ mol‐1 at 0 C
dialectric constant 80
thermal conductivity 0.599 W m‐1 at 20 C
heat capacity of water 4182 J kg‐1 at 20 C
molecular diffusivity, water in air
2.42 10‐5 m2 s‐1 at 20 C
Density 1.000 kg m‐3 at 4 C
Properties of Water
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ESPM 2 The Biosphere
Soil
Root
leaf
atmosphere
Rboundary Layer
Rstomata
Xylem
Rxylem
Rroot/soil
Soil‐Plant‐Atmosphere‐Water Continuum
‐50 MPa
‐0.2 MPa
‐0.7 MPa
‐0.05 MPa
Water Moves UPWARD becauseit flows DOWNHILL Energetically
air soilwaterF
R
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ESPM 111 Ecosystem Ecology
It Takes Energy to Move Water,the Concept of Water Potential
• Water Potential is the Thermodynamic Capacity for a Unit of Water to do Work
• Work is Force times Distance• It Takes Energy to do Work• Water Potential has units of Pressure
– Pressure is Energy per unit volume, or Force per unit Area
Unit, Pa: kg m‐1 s‐2
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ESPM 111 Ecosystem Ecology
It Takes Energy to Move Water,Water Potential
• The total water potential of a system consists of the sum of water potentials associated
– Pressure– Gravity– Solutes– Matric
• Water Moves across Gradients in Water Potential
• Water Potential of Pure Water at Rest is Zero
p g m
Unit, Pa: kg m‐1 s‐2
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ESPM 2 The Biosphere
Measuring Water Potential
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ESPM 2 The Biosphere
Pressure, or Hydrostatic, Water Potential
Pressure exerted by an overlying water column on an infinitesimal cube of water
Force/Area
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ESPM 2 The Biosphere
Osmotic/Solute Water Potential
Change in Energy of Pure Water when Solutes are Added
Solutes reduce the free energy of water by reducing the mobility of water molecules as they are attracted to the charged or polar
surfaces of the solutes
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ESPM 2 The Biosphere
Matric Water Potential
Matric effect reduces the free energy of watermolecules through attractive forces that reduce their mobility
Matric potential refers to the effect of a large polar or charged surface (e.g. soil matrix) on
the water system
interactions between water and solid surfaces act to reduce the activity of water. Results from capillary and adsorptive (van der Waal’s) forces
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ESPM 2 The Biosphere
A Sponge is a Good Example, or Analog, for Matrix potential
It Takes Work, Energy, to squeeze the Sponge to Release Water
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ESPM 2 The Biosphere
Gravity Potential= Density of water times Acceleration of Gravity
times Head Differential
It takes Energy to Lift water Up HillEnergy is Released when Water Flows Down Hill
Conveyance, Storage and Treatment of Water accounts for 19% of CA electricity use
g wgh
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ESPM 2 The Biosphere
Lifting Water by Suction, 10.3 m at sea level
101300atmos g wP gh Pa
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ESPM 2 The Biosphere
What are the Limits on Pumping Water from a Well?How deep can the Water Table Be?
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ESPM 2 The Biosphere
How do Redwood Trees get water up 100m?
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ESPM 2 The Biosphere
Adhesion‐Cohesion Theory
http://www.uic.edu/classes/bios/bios100/lecturesf04am/model.gif
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ESPM 2 The Biosphere
http://www2.puc.edu/Faculty/Gilbert_Muth/art0077.jpg
Why Don’t Leaves Dry Out?
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Osmotic Water Potential:Governs Water Flow In and Out of Stomata and Cells
ESPM 2 The Biosphere
Ion Exchange In Guard Cell,Changes Turgur and Stomatal
Aperture Opens
Water
stomata,Closed
Stomata,Open
H+ K+, CL -
Water
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Key Points
• Again We see the role of water potential for describing the movement of water.
• Water moves downhill Energetically, allowing it to move uphill Physically through the stem of plants
• We described the Soil‐Water‐Plant‐Atmosphere Continuum, SPAC
• Stomata Play key role in regulating water loss by plants
ESPM 2 The Biosphere
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Water in the Atmosphere
ESPM 2 The Biosphere
Saturation Vapor pressureDew point TemperatureRelative HumidityPrecipitation, dew, snow, frost
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Biometeorology, ESPM 129
Saturation Vapor Pressure
• When a pool of water is at constant temperature in a closed container, some water molecules are leaving the liquid and others are condensing and returning to the liquid. Molecules in the head space exert a partial pressure on the system.
• The equilibrium vapor pressure that occurs is called the saturation vapor pressure.
• It is a function of temperature and is independent of pressure.
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ESPM 2 Biosphere
T (oC)
0 10 20 30 40 50 60
e s(T
) (
kPa)
0
2
4
6
8
10
12
14
e T TTs C
C
C
( ) . exp( ..
)
0 611 17502
24097
SATURATION VAPOR PRESSURE, DEW POINT and BOILING WATER
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Relative Humidity• RH = vapor pressure/saturation vapor pressure @ Tair
ESPM 2 The Biosphere
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ESPM 2 The Biosphere
Simple Water Cycle
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ESPM 2 The Biosphere
Precipitation = Evaporation + Runoff + Storage
Hydrological Cycle, USGS
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ESPM 2 The BiosphereD’Odorico et al. 2010 Bioscience
Green Water vs Blue Water
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ESPM 2 The Biosphere
http://ga.water.usgs.gov/edu/watercyclesummary.html#global
A small Fraction is Fresh Water and much smaller fraction is drinkable, or accessible
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ESPM 2 The BiosphereTrenberth et al 2007 J Hydromet
Global Water Pools and Fluxes
Key Fluxes
Land Precip: 113k km3
Runoff: 40k km3
Evaporation: 73k km3
Ocean Precip: 373k km3
Ocean ET: 413k km3
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ESPM 2 The BiosphereTrenberth et al 2007 J Hydromet
Why are Oceans Salty?
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ESPM 2 The Biosphere
Tropics: > 2000 mm; Eastern US > 1000 mm; Western US < 500 mm;Pacific Northwest > 2000 mm; Deserts < 300 mm; Polar Regions < 300 mm
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Precipitation vs Temperature
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ESPM 2 The Biosphere
Places in Hawaii, New Zealand and India receive over 450 inches,rain > 11 m; > 38 feet
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ESPM 2 The Biosphere
How the Biosphere Uses Water
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ESPM 111 Ecosystem Ecology
Evaporation
• Evaporation is the “physical process by which a liquid or solid is converted to a gaseous state” (Glossary of Meteorology).
• Plant canopies introduce water vapor into the atmosphere via transpiration and the evaporation of water from the soil and free water on the leaves and stems.
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Measuring Evaporation
• Pan• Eddy Covariance• Sap Flow• Lysimeter
ESPM 2 The Biosphere
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ESPM 2 The Biosphere
Is evaporation greater from a Pan of Open Water or a well‐Irrigated grass?
Measuring Evaporation
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ESPM 2 The Biosphere
USGS Primer on Water (Leopold and Langbein, 1960) Says:a Large Oak Tree can Transpire 40,000 gallons.
Can we Believe this number?
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ESPM 2 The Biosphere
Inspecting The Claim that a Large Oak Tree can Transpire 40,000 gallons.
40,000 gallons = 151 m3
Assume Tree Crown is 10 m by 10 m
This Tree Must Transpire 1510 mm/y
Average Forest Evaporation is: 495 mm/y
Potential Evaporation for Flooded Rice in Sunny CA ~ 900 mm/y
Only Evergreen Broadleaved Tropical Forests Evaporate ~ 1400 mm/y
Oaks are Deciduous so they will not Transpire Year Round
Some loss is re‐evaporation by interception and soil evaporation
LeopoldLangbein
What is Your Conclusion?
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ESPM 2 The Biosphere
How Much Water Does a Tree Evaporate?: Case Study at Tonzi Ranch
Stand Transpiration: 230 mm/y = 2300 m3/ha‐y
Trees Density: 144 #/ha
Evaporation ~ 15.9 m3/tree‐year = 4216 gallons per tree‐year
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ESPM 2 The Biosphere
Walker Branch Watershed, TN
1628 Trees/ha (site survey)
100 Trees/ha (overstory)
Annual ET = 485 mm
Soil ET: 86 mm
Tree Transpiration: 399 mm = 3990 m3/y‐ha
Evaporation per tree: 2.45 m3/y‐tree= 646 gallon/y‐tree
Evaporation per Overstory Trees: 39.9 m3/y‐tree = 10533 gallon/y‐tree
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Water and the Environment: Biogeophysical‐Ecohydrological View
Water
SurfaceConductance
Transpiration/Evaporation
AvailableEnergy
Photosynthesis/Respiration
LAI
Carbon
NutrientsLitterSoil Moisture
PBL ht
Sensible Heat
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ESPM 2 The Biosphere
Potential Evaporation, Available Energy and Temperature
Rnet (MJ m-2 y-1)
0 1000 2000 3000 4000 5000
PET
(mm
y-1
)
0
200
400
600
800
1000
1200
1400
1600
0C 5C15C25 C
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ESPM 2 The Biosphere
Budyko Curve on Actual and Potential Evaporation and the Water Budget
Actual << Potential Evaporation
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ESPM 2 The Biosphere
Forest Evaporation
ET (mm/y)
500 1000 1500 2000
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
How Much Water Do Forests Evaporate?
Baldocchi and Ryu, 2011 in Forest Hydrology and Biogeochemistry
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Evapo-transpiration
(mm/yr)
Jung et al. 2010 Nature
Global average: 550 mm/yr ~ 63,000 km3/yr (±10-15%)
Current Best‐Estimate on Global Evapotranspiration
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ESPM 2 The Biosphere
How Accurate is the Global Estimate of Land Evaporation?
Budget reports: 73,000 km3
ET tends to be deduced by Residual,the Difference between Precipitation (113k km3) and Runoff (40k km3) using ‘Back of Envelope’ calculations
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Ryu et al. Global Biogeochemical Cycles
North‐South, East‐West Gradients in ET
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ESPM 2 The Biosphere
Major River Basins of the World
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ESPM 2 The Biosphere
California Rivers
SacramentoMokelomneFeatherAmericanConsumnes
San JoaquinMercedStanislausKernKing
EelKlamathRussianSalinas
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High‐resolution fields of global runoff combining observed river discharge and simulated water balances
Global Biogeochemical CyclesVolume 16, Issue 3, pages 15‐1‐15‐10, 7 AUG 2002 DOI: 10.1029/1999GB001254http://onlinelibrary.wiley.com/doi/10.1029/1999GB001254/full#gbc768‐fig‐0008
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Key Pints
• Evaporation and Transpiration vary with Temperature, Available Energy and Available Soil Moisture
• New Earth Observation Systems enable us to measure and synthesize local to global evaporation and runoff.
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Human Water Use
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ESPM 2 The Biosphere
Global Water Use
‘Few Civilizations, dependent upon Irrigated Agriculture have Sustained themselves Indefinitely’, Various UC Davis Water Science Professors
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ESPM 2 The Biosphere
Agricultural water use accounts for about 75% of total global Human consumption
https://www.llnl.gov/news/newsreleases/2007/NR‐07‐08‐02.html
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ESPM 2 The Biosphere
Measuring Storage of Water Basins with GRACE SatelliteGravity Recovery And Climate Experiment
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ESPM 2 The BiosphereRodell and Famiglietti 1999 WRR
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ESPM 2 The Biosphere
Change in Water, detected by GRACE, 2003‐2012
Famiglietti and Rodell, 2013 Science
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ESPM 2 The Biosphere
What is Happening in California, with Groundwater?
Famiglietti et al. 2011 GRL
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ESPM 2 The BiosphereFamiglietti et al. 2011 GRL
Irrigation is Mining Groundwater from the Central Valley at a rate of 20.4 +/‐ 3.9 mm/y
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ESPM 2 The Biosphere
Land Subsidence in the San Joaquin Valley
In 50 years Aquifer Depletion has cause the ground to settle by 9 meters
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ESPM 2 The Biosphere
Loss of the Aral Sea by Intense Irrigation
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ESPM 2 The Biosphere
Disappearance of Aral Sea to Supply Soviet Irrigated‐Cotton Fields
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ESPM 2 The Biosphere
Aral Sea 2013, Google Earth
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ESPM 2 The Biosphere
Why are most of the Wetlands in the Sub Arctic?: Isn’t it a Desert?
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ESPM 2 The Biosphere
FLUXNET Database
Latitude
-60 -40 -20 0 20 40 60 80
Rne
t (G
J m
-2 y
-1)
0
1
2
3
4
5
6
Rnet (GJ m-2 y-1)
0 1 2 3 4 5PE
T (m
m y
-1)
0
200
400
600
800
1000
1200
1400
1600
0C 5C15C25 C
At High Latitudes Potential Evaporation (PET) < 200 mm for Available Energy …
ET < Less than Precipitation
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ESPM 2 The Biosphere
Glaciers and Groundwater
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ESPM 2 The Biosphere
Rapid and Recent Melting of Himalaya Glaciers, Source of Water for over 2 Billion People
Notice lake
1950s
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ESPM 2 The Biosphere
www.globalwarmingart.com
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ESPM 2 The Biosphere
Whiskey is for Drinking; Water is for fighting over
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ESPM 2 The BiosphereD’Ordorico et al Bioscience
Water Scarcity can be a source of ConflictTo manage the Biosphere We have to Disperse Water Fairly
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Take Home Points
• Water Flows Down Hill Energetically• The Global Water Balance, Precipitation is balanced by evaporation, runoff and storage
• Clean, Fresh Drinking Water is Extremely Scarce– Only 3% of the World’s Water is Fresh– Only 0.3% of Fresh Water is Surface Water
• 30% of Freshwater is Groundwater, but it is being rapidly depleted in an unsustainable manner.
ESPM 2 The Biosphere
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Discussion Topics
• What are some Solutions to Stop and Reverse the loss of Ground Water in California?
ESPM 2 The Biosphere
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ESPM 2 The Biosphere
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ESPM 2 The Biosphere
Mean Global Mixing Ratio of Humidity of the Atmosphere
Mass Atmosphere: 5.28 1018 kg
Volume of Water in Atmosphere: 12,900 km3
Density of Water: 1000 kg m‐3
Mass of Water: 1.29 1016 kg
Mean Global Mixing Ratio: 2.44 g/kg == 0.244%
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ESPM 2 The Biosphere
Specific Humidity near the Surface
Dai, 2006 J Climate
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ESPM 111 Ecosystem Ecology
Managing Water in CaliforniaCIMIS ET Map
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ESPM 2 The Biosphere
Water source Water volume, in cubic kilometers
Percent of freshwater
Percent of total water
Oceans 1,338,000k ‐‐ 96.5
Ice caps Glaciers 24,064k 68.7 1.74
Groundwater 23,400k ‐‐ 1.7Fresh 10,530k 30.1 0.76Saline 12,870k ‐‐ 0.94
Soil Moisture 16.5k 0.05 0.001Ground Ice & Permafrost 300k 0.86 0.022
Lakes 176.4k ‐‐ 0.013Fresh 91k 0.26 0.007Saline 85.4k ‐‐ 0.006
Atmosphere 12.9k 0.04 0.001Swamp Water 11.,47k 0.03 0.0008Rivers 2.120k 0.006 0.0002
Biological Water 1.120k 0.003 0.0001
Total 1,386,000k ‐ 100http://ga.water.usgs.gov/edu/watercyclesummary.html#global
Global Water Pools
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ESPM 2 The BiosphereOki and Kanae 2006 Science
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ESPM 2 The Biosphere
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ESPM 2 The BiosphereTyree and Ewers, New Phytologist
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Water on Earth
• Earth Area: 5.1 1014 m2
• Ocean Area: 3.6 1014 m2 (70%)• Land Area: 1.5 1014 m2 (30%)
ESPM 2 The Biosphere
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ESPM 2
Water Movement through Soils, Darcy’s Law
Vt
K A hL
J VAt
K hL
Henry Darcy
The volume of water, V, passing through a bed of sand per unit time is a functionof the cross‐sectional area, A, the thickness of the bed, L, the depth of water on top of the bed,
h, and the hydraulic conductivity of the sand, K:
soils.usda.gov/.../note6fig2_lowres.jpg
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ESPM 2 The Biosphere
Precipitation = Evaporation + Runoff + Storage
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ESPM 2, The BiosphereDai, 2006 J Climate
NH Winter:
RH: ~80% over oceans
RH: 30‐80% over land
NH Summer:
RH: ~80% over oceans
RH: 30‐80% over land
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ESPM 2, The Biosphere
Vapor Pressure Deficit Map