COLA / AOES Land Group

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Prof. Paul Dirmeyer
Building: Research Hall
Office: Room 266
Mail stop: 6C5
Phone: +1-703-993-5363



The Latest

Numerous Updates to Coupling Metrics Cheat Sheets

August 2018: Version 2.7 of the land-atmosphere coupling metrics "cheet sheets" has been posted at:

Animation shows seasonal cycle of land-atmosphere coupling

L-A coupling animation

The animation above shows the mean seasonal cycle (moving 30-day window) of global land-atmosphere coupling, estimated from a blend of three reanalyses each covering about 3 decades, and two metrics; one measuring the terrestrial leg and one the atmospheric leg of feedback from land to atmosphere. Green shaded areas show where the link between soil moisture and evaporation is strong, but the atmosphere does not convey the signal from surface fluxes to boundary layer development. Blue areas show the opposite, where the atmospheric link in the feedback loop is in place but the land surface does not convey soil moisture anomalies into surface flux anomalies. Red regions have complete linkage and denote "hot spots" of land-atmosheric coupling, which grow, shrink and migrate during the year.
Fascinating details are evident. L-A coupling over North America expands north from Mexico to Canada in the spring, and retreats slowly in the fall. The onset and disspiation of coupling over Eurasia is much more abrupt. At low latitudes, wet monsoon regions are largely uncoupled (black) but coupling is strong during the dry season. Some areas (e.g., in Queensland, Austalia, Ethiopia or parts of India) remain hot spots throughout the year. Find your favorite corner of the world and stare!

Prof. Paul Dirmeyer has been named a Fellow of the American Geophysical Union in the Hydrology Section. Only one in 1000 AGU members can be recognized annually with this honor. Prof. Dirmeyer will be recognized during the Honors Tribute during the 2017 AGU Fall Meeting in New Orleans in December.

Ph.D. student Holly Norton has been awarded an internship for 2017 from the National Centers for Environmental Prediction (NCEP) Summer Student Internship Program. She will be working at the NOAA Center for Weather and Climate Prediction in College Park, Maryland, where she will implement a more realistic treatment in the Noah land surface model of the movement of water below the land surface where karst and other porous and fractured rock underlies the surface, affecting the availability of soil moisture.

Prof. Paul Dirmeyer has been named to the Scientific Steering Group of the Global Water and Energy Exchanges Project (GEWEX). The SSG guides the formation of GEWEX's scientific program, and is comprised of scientists from across the world who study issues related to the global water and energy cycles. The SSG also briefs the Joint Steering Committee of the World Climate Research Programme (WCRP), on progress made within GEWEX and general advances in understanding in our areas of scientific expertise.

Post-doc Liang Chen won the "Paper of the Year Award" award from the Climate Specialty Group of the Association of American Geographers (AAG). Liang was invited to present the paper titled "Biogeophysical Impacts of Land Cover / Land Use Change on Climate," at the AAG Annual Meeting in San Francisco, California, 29 March - 2 April 2016.