Abstract
Abstract. Monsoon rainfall is of great importance for agricultural production in both China and India. Understanding the features of the Indian and Chinese monsoon rainfall and its long term predictability is a challenge for research. In this paper Principal Component Analysis (PCA) method was adopted to analyze Indian monsoon and Chinese monsoon separately as well as jointly during the period 1951 to 2003. The common structure of Indian monsoon and Chinese monsoon rainfall data was explored, and its correlation with large scale climate indices and thus the possibility of prediction were analyzed. The joint PCA results gives a clearer correlation map between Chinese monsoon rainfall and Indian monsoon rainfall. The common rainfall structure presents a significant teleconnection to Sea Surface Temperature anomaly (SSTa), moisture transport and other climate indices. Specifically, our result shows that Northern China would garner less rainfall when whole Indian rainfall is below normal, and with cold SSTa over the Indonesia region more rainfall would be distributed over India and Southern China. The result also shows that SSTa in the previous winter months could be a good indicator for the summer monsoon rainfall in China.
Highlights
Chinese monsoon and Indian monsoon are important for agricultural production and economy in China and India (Parthasarathy et al, 1988; Webster et al, 1998; Abrol and Gadgil, 1999)
It is widely believed that annual variations of Indian monsoon and Chinese monsoon are both teleconnected to tropical Sea Surface Temperature (SST), which plays an important role in the large scale climate system
Quite a few studies indicate that Chinese monsoon and Indian monsoon are correlated in some way
Summary
Zhou et al.: Insights from a joint analysis of Indian and Chinese monsoon rainfall data It can be, concluded that Indian monsoon and Chinese monsoon are correlated in some way, and they are influenced by some common climate drivers At annual scale) the ways of influencing are different Encouraged by these existing results, we consider that Indian monsoon and Chinese monsoon belong to a larger monsoon structure. In Chinese part, the monsoon season varies from region to region, i.e., it begins earlier in Southeastern China while later in Northern China On average, it lasts for four months from June to September.
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