Spatiotemporal change of Plum Rains in the Yangtze River Delta and its relation with atmospheric circulation during the period of 1960-2012

Authors: Nina Zhu*,
Topics: Climatology and Meteorology
Keywords: plum rains, EEMD, East Asian Summer Monsoon, El Niño-Southern Oscillation, Pacific Decadal Oscillation, the Yangtze River Delta
Session Type: Paper
Day: 4/11/2018
Start / End Time: 10:00 AM / 11:40 AM
Room: Napoleon B3, Sheraton 3rd Floor
Presentation File: No File Uploaded

Based on the dataset from 33 meteorological stations about the onset and outset of plum rains as well as daily precipitation during the period of 1960‐2012, we investigated the spatiotemporal change of plum rains and its relation with atmospheric circulation by an integrated approach combining the ensemble empirical mode decomposition (EEMD), Kriging interpolation, and correlation analysis. The main conclusions are as follows: (1) the plum rainfall (i.e. the rainfall during the period of plum rains) increased approximately 71mm with a peak of 485.51mm in 1998 and a valley of 14.27mm in 1965, and the high-value center shows a trend toward the northern gradually. Besides, the onset of plum rains advances approximately 3 days and the outset of plum rains delays approximately 6 days; (2) the EEMD shows that the plum rainfall presents an inter-annual change (quasi-3 and quasi-6) and an inter-decadal change (quasi-13 and quasi-33), but the inter-annual change is more significant than inter-decadal change on the overall plum rains; (3) the changes of plum rainfall are affected by different factors in different time scales. And the difference is that El Niño-Southern Oscillation (ENSO), East Asian Summer Monsoon (EASM), and Pacific Decadal Oscillation (PDO) are the main influencing factors in the period of 2-3a, 5-6a, and 32-33a, respectively.

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