Early Summer Northeast Cold Vortex Index Dataset (1961-2010)

HE Liye1MA Ning1GUO Jun1

1 Tianjin Climate Center，Tianjin 300074，China

DOI:10.3974/geodb.2023.06.06.V1

Published:Jun. 2023

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Key Words：

Northeast Cold Vortex,early summer precipitation,Haihe River Basin,climate effect

Abstract：

The Northeast Cold Vortex (NECV) is a major synoptic system at the mid and high latitudes of East Asia, of which the frequent activities have significant “climate effects”, that may cause temperatures and precipitation anomalies, not just in Northern China, but in the Haihe River Basin (HRB). NECV events were defined if the following three conditions were satisfied in the region of 35°N - 60°N，115°E - 145°E: first, if a vortex center could be identified at 500 hPa geopotential height field; second, if a cold trough or a cold center existed around the vortex center at the same pressure level; and third, if the vortex center accompanied with the cold trough or cold core persisted for at least three days. Considering the geographical location of the HRB, a key area (38°N - 48°N，115°E - 125°E) of the NECV activities closely correlated with early summer precipitation in the HRB was determined by the southernmost locations of the low pressure center at 500 hPa during the NECV events in the western region of 115°E - 125°E year by year. According to the weather conditions of the NECV processes, NECV events were identified using the daily reanalysis data with a horizontal resolution of 2.5°x2.5° came from the NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research), and the early summer NECVI dataset was derived from the standardized frequency of the low pressure center in a key area during the NECV events, spanning from 1961 to 2010. The deposited dataset includes: (1) standardized NECVI in early summer; (2) southernmost locations of the low pressure center at 500 hPa during the NECV events over 115°E - 125°E in annual early summer. The dataset is archived in one excel file with data size of 16 KB. The analysis based on this dataset have been published in Chinese Journal of Geophysics, Vol. 60, No.10, 2017.

Foundation Item：

Ministry of Science and Technology of P. R. China (GYHY201506001-1); Tianjin Meteorological Service (201628bsjj01)；

Data Citation：

HE Liye, MA Ning, GUO Jun. Early Summer Northeast Cold Vortex Index Dataset (1961-2010)[J/DB/OL]. Digital Journal of Global Change Data Repository, 2023. https://doi.org/10.3974/geodb.2023.06.06.V1.

Data Product: