Inhomogeneous distribution of precipitation in Northeast China agricultural zone and its response to regional warming

doi:10.12006/j.issn.1673-1719.2018.003

Abstract

Abstract:

The rational allocation of heat and water provides favorable climatic conditions for agricultural production. It is important to make clear the matching and variation rule of heat and water for guiding agricultural production. Based on the data of daily precipitation and temperature from 1961 to 2014 in Northeast China agricultural zone (NCAZ), the variation law of inner-annual inhomogeneous distribution of precipitation (IIDP) and its response to regional warming in NCAZ were analyzed. The results show that: (1) In 1961-2014, the trends was found and characterized by decreasing IIDP, increasing inter-annual variation of IIDP and being more early precipitation concentration period (PCP) consistently in the whole NCAZ; (2) The decrease rate of IIDP was larger in the middle of NCAZ, contrast to smaller value in southern and northern part of NCAZ; (3) The IIDP depended on air temperature strongly, which showed obvious asynchronism and inter-regional difference with precipitation concentration degree (PCD) being behind air temperature on short period and beyond on long period mainly. In a more warming world, the advance of PCP keeps simultaneous heat and precipitation stable, but the decrease of IIDP and the increase of the inter-annual variation may increase the risk of summer drought in NCAZ. The results can provide a reference for formulating scientific farmland water management strategies.

Key words: Precipitation concentration degree (PCD), Precipitation concentration period (PCP), Simultaneous heat and precipitation, Climate warming

Hong LIU,Chuan-You REN,Shuo-Zhou XU,Feng-Qian CUI,Dan-Qi PANG. Inhomogeneous distribution of precipitation in Northeast China agricultural zone and its response to regional warming[J]. Climate Change Research, 2018, 14(4): 371-380.

Figures/Tables 8

Fig. 1 Distribution of the meteorological stations in Northeast China agricultural zone.

Fig. 2 Spatial distribution of PCD (a) and PCP (b) (10 d) of the 1961-2014 average in Northeast China agricultural zone.

Table 1 Variance contribution and cumulative variance contribution rate for first four REOF modes of PCD and PCP in Northeast China agricultural zone

Fig. 3 Type division for distribution of precipitation in Northeast China agricultural zone in 1961-2014.

Fig. 4 Interannual variations of PCD and its stability in each divisions of Northeast China agricultural zone in 1961-2014.

Fig. 5 Interannual variations of PCP and its stability in each divisions of Northeast China agricultural zone in 1961-2014.

Fig. 6 Trend variability and average annual temperature of PCD (a) and PCP (b) in Northeast China agricultural zone in 1961-2014.

Fig. 7 Cross spectrum analysis between PCD and average annual temperature in Northeast China agricultural zone.

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