collaborative research: a heat budget analysis of the arctic climate system
DESCRIPTION
Collaborative Research: A Heat Budget Analysis of the Arctic Climate System Mark C. Serreze, Andrew Barrett, Andrew Slater CIRES/NSIDC, University of Colorado, Boulder, CO Michael Steele Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle WA. Objective: - PowerPoint PPT PresentationTRANSCRIPT
Collaborative Research: A Heat Budget Analysis of the Arctic
Climate System
Mark C. Serreze, Andrew Barrett, Andrew Slater
CIRES/NSIDC, University of Colorado, Boulder, CO
Michael Steele
Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle WA
Objective:
Examine the Arctic climate system from the integrating, yet
simplifying viewpoint of its large-scale heat budget
Draw From
ERA-40 and NCEP ReanalysesOceanographic ObservationsTerrestrial Observations
Satellite DataLand Surface Models
Coupled Ice-Ocean Models
What are the interplays between heat transports from lower latitudes, extreme seasonality in radiative forcing and heat exchanges between atmospheric and subsurface reservoirs that shape the observed state of the Arctic’s coupled atmosphere-land-ice-ocean system?
How are recent changes and projected future statesof the Arctic system reflected in components of the heat budget, and can we separate forcing from response?
What are the major uncertainties that hamper our ability to achieve a system-level understanding?
Science Questions
Heat Budget Equations:
• Atmospheric Column
ΔE/Δt = Fwall+Frad+Fsfc
• Ice/Ocean Land Column
ΔE*/Δt = Fo+Fi-Fsfc
Moist Static Energy Flux Latent Heat Flux
Atmospheric Heat Fluxes Across 70 deg. N
Annual Cycle of Atmospheric Terms from
ERA-40
Annual Cycle of Surface Terms from
ERA-40
Important Point: There are large seasonal variations inthe net surface flux. Acts as a negative feedback.
Jan 3.65633 Feb 2.95006 Mar 3.01168 Apr 2.92278 May 3.49785 Jun 4.90397 Jul 6.20166 Aug 7.25292 Sep 7.33829 Oct 7.01069Nov 6.52471 Dec 3.66975
MJ * 1015
Months
Arctic Ocean Sensible Heat Content
Arctic Ocean Sensible Heat Content
1000 MJ/m2 1000 MJ/m2
Annualmean
70-90 degN
J M M MJ S NF A J A O D
Courtesy M. Steele
Seasonality in the Sea Ice Cover
ERA-40 Net Surface Heat Flux (1979-2001)
Courtesy NSIDC
Energy Fluxes Across 70 deg. N
ERA-40 Residual Heat Flux (1979-2001)
Net Surface Heat Flux for the Arctic Ocean from ERA-40
Need to examine data from MERRA, CERES,coupled ice-ocean models and AOGCMs
Annual Mean Temperature Anomalies By Heightand Latitude: 2000 to 2005 (Referenced to 1979 to 1999)
Annual Mean Temperature Anomalies by Height and Latitude for 2005
(Referenced to 1979-2004)
Questions?
End of slideshow