Premium
The North American Monsoon System in the Hadley Centre Coupled Ocean‐Atmosphere GCM
Author(s) -
Arritt Raymond W.,
Goering Dustin C.,
Anderson Christopher J.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010978
Subject(s) - climatology , precipitation , troposphere , hadley cell , environmental science , atmosphere (unit) , monsoon , atmospheric sciences , gcm transcription factors , climate model , atmospheric circulation , general circulation model , climate change , meteorology , geology , geography , oceanography
The North American monsoon system (NAMS) as represented in the second‐generation Hadley Centre coupled ocean‐atmosphere model is examined using high‐time‐resolution (six‐hourly) records of model output. A current‐climate simulation gives a realistic depiction of the NAMS, with date of onset and precipitation trends agreeing with observations. The model reproduces the observed negative relationship between precipitation over the southwestern U.S. and that over the central U.S. Changes in tropospheric circulation and moisture after onset are consistent with observed changes although mid‐level moistening is less than is observed. An enhanced greenhouse‐gas simulation gives higher precipitation and stronger tropospheric dynamical and moisture changes after onset.