H33L-08
–
Disentangling climatic and anthropogenic controls on global terrestrial evapotranspiration trends
Authors
- Jiafu Mao
- Oak Ridge National Laboratory
- Wenting Fu
- University of Texas Austin
- Xiaoying Shi
- Oak Ridge National Laboratory
- Daniel Ricciuto
- Oak Ridge National Laboratory
- Joshua Fisher
- NASA Jet Propulsion Laboratory
- Robert Dickinson
- University of Texas Austin
- Yaxing Wei
- Oak Ridge National Laboratory
- Willis Shem
- Oak Ridge National Laboratory
- Shilong Piao
- Peking University
- Kaicun Wang
- Beijing Normal University
- Christopher Schwalm
- Federal GEOS Funding
- Hanqin Tian
- Auburn University Montgomery
- Mingquan Mu
- University of California Irvine
- Muhammad Atlaf Arain
- McMaster University
- Philippe Ciais
- LSCE Laboratoire des Sciences du Climat et de l’Environnement
- Robert Cook
- Oak Ridge National Laboratory
- Yong Jiu Dai
- Beijing Normal University
- Daniel Hayes
- University of Maine
- Forrest Hoffman (forrest at climatemodeling dot org)
- Oak Ridge National Laboratory
- Maoyi Huang
- Pacific Northwest National Laboratory
- Suo Huang
- McMaster University
- Deborah Huntzinger
- Northern Arizona University
- Akihiko Ito
- NIES National Institute of Environmental Studies
- Atul Jain
- University of Illinois at Urbana Champaign
- Anthony King
- Oak Ridge National Laboratory
- Huimin Lei
- Tsinghua University
- Chaoqun Lu
- Iowa State University
- Anna Michalak
- Carnegie Institution for Science Washington
- Nicholas Parazoo
- NASA Jet Propulsion Laboratory
- Changhu Peng
- University of Quebec at Montreal
- Shushi Peng
- LSCE Laboratoire des Sciences du Climat et de l’Environnement
- Benjamin Poulter
- Montana State University
- Kevin Schaefer
- University of Colorado
- Elchin Jafarov
- Institute of Arctic and Alpine Research
- Peter Thornton
- Oak Ridge National Laboratory
- Weile Wang
- CSUMB & NASA/AMES
- Ning Zeng
- University of Maryland College Park
- Zhenzhong Zeng
- Peking University
- Fang Zhao
- University of Maryland College Park
- Qiuan Zhu
- Northwast A&F University
- Zaichun Zhu
- Peking University
Session
Evapotranspiration, Evaporative Demand, and Droughts: From Empirical Shortcuts to Process-Based Understanding II
Wednesday, December 16, 2015 15:25–15:40
Moscone West 3022
Abstract
We examined natural and anthropogenic controls on terrestrial
evapotranspiration (ET) changes from 1982–2010 using multiple
estimates from remote sensing-based datasets and process-oriented land
surface models. A significant increased trend of ET in each hemisphere was
consistently revealed by observationally-constrained data and multi-model
ensembles that considered historic natural and anthropogenic drivers. The
climate impacts were simulated to determine the spatiotemporal variations
in ET. Globally, rising CO2 ranked second in these models
after the predominant climatic influences, and yielded decreased trends
in canopy transpiration and ET, especially for tropical forests and
high-latitude shrub land. Increased nitrogen deposition slightly amplified
global ET via enhanced plant growth. Land-use-induced ET responses,
albeit with substantial uncertainties across the factorial analysis,
were minor globally, but pronounced locally, particularly over regions
with intensive land-cover changes. Our study highlights the importance
of employing multi-stream ET and ET-component estimates to quantify the
strengthening anthropogenic fingerprint in the global hydrologic cycle.
Forrest M. Hoffman (forrest at climatemodeling dot org)