TY - JOUR
T1 - Tropical drought regions in global warming and El Niño teleconnections
AU - Neelin, J. D.
AU - Chou, C.
AU - Su, H.
PY - 2003/12/15
Y1 - 2003/12/15
N2 - Climate model global warming simulations predict large regional changes in tropical rainfall, including regions of drought. Qualitatively similar changes occur during El Niño interannual variability. Using an intermediate climate model, we have identified a mechanism that creates regional reductions in precipitation at the margins of convection zones during warming. In this "upped-ante mechanism", a warm troposphere increases the value of surface boundary layer moisture required for convection to occur. In regions of plentiful moisture supply, moisture simply rises to maintain precipitation, but this increases the moisture gradient relative to neighboring subsidence regions. Reductions in rainfall then result for those margins of convection zones that have strong inflow of air from the subsidence regions and less frequently meet the increased "ante" for convection. In simulations analyzed here, this new mechanism is the leading cause of tropical drought in the global warming case and is dominant in certain El Niño drought regions.
AB - Climate model global warming simulations predict large regional changes in tropical rainfall, including regions of drought. Qualitatively similar changes occur during El Niño interannual variability. Using an intermediate climate model, we have identified a mechanism that creates regional reductions in precipitation at the margins of convection zones during warming. In this "upped-ante mechanism", a warm troposphere increases the value of surface boundary layer moisture required for convection to occur. In regions of plentiful moisture supply, moisture simply rises to maintain precipitation, but this increases the moisture gradient relative to neighboring subsidence regions. Reductions in rainfall then result for those margins of convection zones that have strong inflow of air from the subsidence regions and less frequently meet the increased "ante" for convection. In simulations analyzed here, this new mechanism is the leading cause of tropical drought in the global warming case and is dominant in certain El Niño drought regions.
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000187864800005
UR - https://openalex.org/W2167393797
UR - https://www.scopus.com/pages/publications/1642586540
U2 - 10.1029/2003GL018625
DO - 10.1029/2003GL018625
M3 - Journal Article
SN - 0094-8276
VL - 30
SP - CLM 5-1 - CLM 5-4
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 24
ER -
