We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Interdecadal Pacific Oscillation responsible for the linkage of decadal changes in precipitation/moisture in arid central Asia and humid Asian monsoon region during the last millennium.
- Authors
Hongna Xu; Tao Wang; Huijun Wang
- Abstract
Reconstruction and observational studies imply a potential linkage of moisture/precipitation change in arid central Asia and monsoonal East Asia, in which the evolution of moisture/precipitation in central Asia is out-of-phase with that in northern China, but in-phase with that in southern China. In order to ascertain whether there is a robust linkage between the changes in climate in Asian arid regions and monsoon regions and to elucidate the underlying dynamic mechanisms, we analyzed the Last Millennium Reanalysis dataset and output from the Community Earth System Model-Last Millennium Ensemble (CESM-LME). The results indicate a significant decadal linkage between precipitation changes in central Asia's arid region and the Asian monsoon region during the last millennium, which is primarily driven by the Interdecadal Pacific Oscillation (IPO). In spring, the positive IPO could enhance westerlies over the Mediterranean Sea and to its east, which could transport more water vapor and cause increased precipitation over central Asia. In summer, the positive IPO is accompanied with weakened Asian monsoon and southward Asian subtropical westerly jet, which can lead to increased (decreased) summer precipitation over southern China (over northern China and South Asia). The IPO plays a dominant role in connecting the decadal variations in precipitation between arid central Asia and monsoonal Asia by modulating the precipitation of their respective major rainy seasons. Model results suggest that this decadal linkage stems entirely from the internal variability present in the CESM-LME control and all single-forcing simulations. Changes in external forcing factors do not alter this inherent linkage caused by IPO. Moreover, based on analyses of the aridity index and soil moisture content, this relationship of precipitation variation also causes a similar decadal linkage of moisture changes in central Asia and monsoonal Asia. The differences in the multi-centennial-scale moisture/precipitation variations in the Asian arid region and the monsoon region between the Medieval Climate Anomaly and Little Ice Age are also likely caused by IPO-like sea surface temperature anomalies.
- Subjects
ASIA; CHINA; ARID regions climate; LITTLE Ice Age; WATER vapor transport; ARID regions; WESTERLIES; OCEAN temperature; MONSOONS
- Publication
Climate of the Past Discussions, 2023, p1
- ISSN
1814-9324
- Publication type
Article
- DOI
10.5194/cp-2023-53