preliminary meteorological measurement standards
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Preliminary Meteorological Measurement Standards. Statement of standards before site selection (TIE 1979) Selected sites assume obligations To collect data To characterize the ecosystem To make data available Original Meteorological Committee - PowerPoint PPT PresentationTRANSCRIPT
Preliminary Meteorological Measurement Standards Statement of standards before site selection (TIE
1979) Selected sites assume obligations
To collect data To characterize the ecosystem To make data available
Original Meteorological Committee Dr. Harvey L. Ragsdale and Dr. Lloyd W. Swift of the Coweeta
LTER site were co-chairs Swift and Ragsdale, 1985
Original LTER Meteorological Standards
Standards (Swift and Ragsdale 1985) Original LTER planning document (TIE 1979) Site-specific material (Waring et al. 1978) National Weather Service (USDC 1970) World Meteorological Organization documentation
(WMO 1970, 1971) LTER scientist experience
Climate Committee Established 1986Objectives
Establish baseline meteorological measurements Characterize each LTER site Enable intersite comparisons
Document both cyclic and long-term changes Provide a detailed climatic history
Correlate with bioecological phenomena Provide data for modeling
provide a basis for coordinating specialized or short term meteorological measurements
Standards Document 1986
Standardized measurements (4 levels) Not a single inclusive set Established degrees of uniformity Flexible for site specific requirements
Instrumentation, frequency, reporting guidelines Site selection guidelines Retention of original records required Statement of accuracy and precision levels
Standardized Measurements (4 Levels)
Level 0: entry level only (1 year) Daily temp and precipitation (all LTER sites)
Level 1: basic climatic station Continuous temperature, precipitation, humidity, wind
(all LTER sites will achieve) Level 2: research meteorological station
More intensive, more parameters, continuous (most LTER sites) Level 3: specialized measurements
Coordinate plans to develop standardized techniques Facilitate potential intersite comparisons
Intersite Exchange of Data (1986)
Each site must make one station’s data available Specific single site study data may be proprietary Sharing of data will not be automatic
Individual requests will be necessary If future intersite study is anticipated
Plan for identical instrumentation and methods Pay special attention to reporting accuracy and precision Seek advice from climate committee
http://sql.lternet.edu/climdb/climdb.html
LTER Information Manager Activities
Network Information System (NIS)
All-site bibliography All-site personnel directory Distributed Table of Contents (DTOC) Site Description Database (SiteDB) Climate Database Project (ClimDB)
NIS Research Module Strategy
Enable cross-site data integration Centralize access to cross-site data Local site maintains control of data Modular design Prototype development
ClimDB “Centributed” Mechanics (Baker et al. 2000)
Individual Site Central Site Public User
Exchange filters
Exchange format
Relational Database
Site Database
CG
I S
crip
tL
ocal
Scr
ipt
Dynamic URL
Static URL
CG
I S
crip
t
Distribution filters
Reportformats
Monthly Data (V-One,V-Many)
Daily Data
GraphicsH
arve
ster
ClimDB Project Objectives
For all LTER sites:
Provide current climatic data summaries Provide comparable climatic data summaries Fulfill the needs of LTER intersite and synthesis
efforts Demonstrate “centributed” database approach
ClimDB Background
LTER Climate Committee (Greenland 1986)Standardized baseline meteorological measurements
CLIMDES (Greenland et al. 1996)LTER site monthly summaries (1961-1990)
XROOTS Climate Workshop (Bledsoe et al. 1996)Report formats (V-one, V-many)
LTER Information Management Committee Meeting (1996)“Centributed” database, exchange format, harvest mechanism
CLIMSTAN Workshop (Greenland et al. 1997)Exchange format refinement, Metadata standard development
Communication of the Research Scientist with the Information Manager is important!
Please fill out the web
form
“This is too good
to be true”
I can’t wait to give you
my metadata
Identifying End-User Needs
XROOTS Climate Workshop Identification of distribution report formats Separation of internal data management storage structures
from exchange and report formats
CLIMSTAN Workshop: Blend of Science and Information Management Participants included Climatologists, Information Managers,
Data Users/Modelers, and a Field Technician
CLIMSTAN Workshop Accomplishments
New LTER standard climate methods documentation Defines levels of site participation (0-4)
Database guidelines documentation Exchange format Quality assurance (local and network guidelines) Participation instructions Naming conventions (time resolution, parameter, aggregation, units)
Metadata requirements and schema Data distribution through a web interface
Report format refinement Graphical format refinement
Metadata “R” Us
Data Integration
Data Interpretation
Data Discover
y
“I never metadata I didn’t like”
Metadata Serves Important RolesMetadata Serves Important Roles
LTER NETWORK METEOROLOGICAL METADATA SCHEMA
MEASUREMENT_LEVEL
LTER_CODESTATION_CODE
LATITUDELONGITUDESTATION_DESCRIPTIONTOPOGRAPHY ELEVATIONSURFACE_TYPEEXPOSUREWIND_EXPOSURESTATION_STARTSTATION_HISTORYSTATION_PHOTO
STATION_LEVELLTER_SITE_LEVEL
LTER_CODE
CLIMATE_CONTACT_NAMECLIMATE_CONTACT_EMAILCLIMATE_CONTACT_PHONEDATA_CONTACT_NAMEDATA_CONTACT_EMAILDATA_CONTACT_PHONEQUALITY_ASSURANCEPRIMARY_STATIONSECONDARY_STATIONSCLIMDES_URLCOMMENTS
LTER_CODESTATION_CODEWHAT_MEASURED
BEGIN_DATELOG_INTERVALSUMMARY_INTERVALINSTRUMENT_HEIGHTMEASUREMENT_HISTORYOBSERVATION_METHODINSTRUMENT_TYPEACCURACYCALIBRATION_HISTORY
NIS Research Module Issues / Lessons Learned
Science must drive development Site participation necessary – provide incentives Metadata capture and integration with data Host site commitment of resources and time Long-term maintenance and continual updates Proprietary rights – provide data use agreement
Data Use Agreement
Assures data provider of ethical use of data Provides citation for data source Gives protection through disclaimer Requires notification of data usage Requests copies of derivative publications Encourages good scientific citizenship
Successful Intersite Collaboration(Webster 2000)
Collegiality, trust, respect Site visits: method, procedure coordination Incentives for participation
Publications Monetary support
Baseline of data and prior research Time and patience Effective Leadership
Typical Intersite Study: Information Management
Scientist serves as data manager Complete metadata is not assembled Long-term accessibility to the database is not
planned Future updates to the database are not possible
ClimDB Variable Names LTER_Site The three-letter LTER site code
Station Local site name for the weather station (10character max)
Date An 8 character field, yyyymmdd
Daily_AirTemp_Mean_CFlag_Daily_AirTemp_Mean_C
Daily mean air temperatureData quality flag for daily mean airtemperature.
Daily_AirTemp_AbsMax_CFlag_Daily_AirTemp_AbsMax_C
Absolute maximum air temperature.Data quality flag for absolute maximum airtemperature
Daily_AirTemp_AbsMin_CFlag_Daily_AirTemp_AbsMin_C
Absolute minimum air temperature.Data quality flag for absolute minimum airtemperature
Daily_Precip_Total_mmFlag_Daily_Precip_Total_mm
Daily total precipitationData quality flag for daily totalprecipitation
Extension of ClimDB to Level 2 & 3
Measurement Parameter Name UnitsAir Temperature Airtemp CPrecipitation Precip MmRelative Humidity Rh PctWind Speed Windsp MsecWind Direction Winddir DegResultant Wind Speed Reswindsp MsecResultant Wind Direction Reswinddir DegStandard Deviation of WindDirection
Stdevwinddir Deg
Global Radiation Globalrad Jcm2Vapor Pressure Vaporpressure KpascalAtmospheric Pressure Atmpressure KpascalDewpoint Temperature Dewpointtemp CSnow Depth Snowdepth MmPan Evaporation Panevap MmdaySoil Temperature at xx cm(e.g., 5 cm)
Soiltempxx (e.g.,soiltemp05)
C
Soil Moisture at xx cm (e.g.,5 cm)
Soilmoisturexx(e.g., soilmoisture05)
Units unresolved :two possible units
Monthly Distribution FormatsV-One
DVS 003 MATMPMYear Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec1990 45.0 50.0 53.0 58.0 64.4 70.9 74.5 73.4 70.6 63.2 53.0 45.71991 44.1 50.5 52.2 59.3 65.0 70.2 73.4 72.4 71.3 64.1 53.8 46.6 1992 46.8 49.0 51.6 55.4 63.4 72.3 76.7 75.4 69.6 62.3 52.2 44.8
DVS 003 MPRECIPYear Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec1990 4.20 2.58 1.80 1.30 0.37 0.15 0.03 0.04 0.22 0.99 2.36 3.28
V-Many DVS 003 Year Month MATMPM MATMPI MATMPX MPRECIP1990 Jan 45.0 37.2 52.7 4.201990 Feb 50.0 40.3 59.6 2.581990 Mar 53.0 41.3 64.7 1.801990 Apr 58.0 44.4 71.5 1.30