TY - JOUR
T1 - Links between Indo-Pacific climate variability and drought in the Monsoon Asia Drought Atlas
AU - Ummenhofer, Caroline C.
AU - D'Arrigo, Rosanne D.
AU - Anchukaitis, Kevin J.
AU - Buckley, Brendan M.
AU - Cook, Edward R.
N1 - Funding Information:
Use of the following observational and reanalysis products is gratefully acknowledged: PDSI, CMAP, and NCEP/NCAR reanalysis data provided by NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, through their website http://www.cdc.noaa.gov , and HadISST by the UK Met Office. Development of the MADA was supported by the U.S. National Science Foundation Paleoclimate Program award ATM 04-02474. The work was further supported by the Australian Research Council and the Australian Academy of Science through its Scientific Visits to North America Program. An earlier version of the manuscript benefitted from comments by two anonymous reviewers. Lamont-Doherty Earth Observatory Contribution No. 7570.
PY - 2013/3
Y1 - 2013/3
N2 - Drought patterns across monsoon and temperate Asia over the period 1877-2005 are linked to Indo-Pacific climate variability associated with the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). Using the Monsoon Asia Drought Atlas (MADA) composed of a high-resolution network of hydroclimatically sensitive tree-ring records with a focus on the June-August months, spatial drought patterns during El Niño and IOD events are assessed as to their agreement with an instrumental drought index and consistency in the drought response amongst ENSO/IOD events. Spatial characteristics in drought patterns are related to regional climate anomalies over the Indo-Pacific basin, using reanalysis products, including changes in the Asian monsoon systems, zonal Walker circulation, moisture fluxes, and precipitation. A weakening of the monsoon circulation over the Indian subcontinent and Southeast Asia during El Niño events, along with anomalous subsidence over monsoon Asia and reduced moisture flux, is reflected in anomalous drought conditions over India, Southeast Asia and Indonesia. When an IOD event co-occurs with an El Niño, severe drought conditions identified in the MADA for Southeast Asia, Indonesia, eastern China and central Asia are associated with a weakened South Asian monsoon, reduced moisture flux over China, and anomalous divergent flow and subsidence over Indonesia. Insights into the relative influences of Pacific and Indian Ocean variability for Asian monsoon climate on interannual to decadal and longer timescales, as recorded in the MADA, provide a useful tool for assessing long-term changes in the characteristics of Asian monsoon droughts in the context of Indo-Pacific climate variability.
AB - Drought patterns across monsoon and temperate Asia over the period 1877-2005 are linked to Indo-Pacific climate variability associated with the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). Using the Monsoon Asia Drought Atlas (MADA) composed of a high-resolution network of hydroclimatically sensitive tree-ring records with a focus on the June-August months, spatial drought patterns during El Niño and IOD events are assessed as to their agreement with an instrumental drought index and consistency in the drought response amongst ENSO/IOD events. Spatial characteristics in drought patterns are related to regional climate anomalies over the Indo-Pacific basin, using reanalysis products, including changes in the Asian monsoon systems, zonal Walker circulation, moisture fluxes, and precipitation. A weakening of the monsoon circulation over the Indian subcontinent and Southeast Asia during El Niño events, along with anomalous subsidence over monsoon Asia and reduced moisture flux, is reflected in anomalous drought conditions over India, Southeast Asia and Indonesia. When an IOD event co-occurs with an El Niño, severe drought conditions identified in the MADA for Southeast Asia, Indonesia, eastern China and central Asia are associated with a weakened South Asian monsoon, reduced moisture flux over China, and anomalous divergent flow and subsidence over Indonesia. Insights into the relative influences of Pacific and Indian Ocean variability for Asian monsoon climate on interannual to decadal and longer timescales, as recorded in the MADA, provide a useful tool for assessing long-term changes in the characteristics of Asian monsoon droughts in the context of Indo-Pacific climate variability.
KW - Asian monsoon
KW - Climate variability
KW - Drought
KW - El Niño-Southern Oscillation
KW - Indian Ocean dipole
KW - Indo-Pacific
KW - MADA
KW - Tree rings
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U2 - 10.1007/s00382-012-1458-1
DO - 10.1007/s00382-012-1458-1
M3 - Article
AN - SCOPUS:84874297922
VL - 40
SP - 1319
EP - 1334
JO - Climate Dynamics
JF - Climate Dynamics
SN - 0930-7575
IS - 5-6
ER -