Evaluating Aridity and Wetness of the Wheat with Palmer Moisture Anomaly Index in the East of Northwest China

Wang Yue; Jiang Zhihong; Zhang Qiang; Li Ke; Liu Mei; Xue Chunfang

Vol.19, NO.3, 2008

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2008 > 19(3): 342-349

Wang Yue, Jiang Zhihong, Zhang Qiang, et al. Evaluating aridity and wetness of the wheat with Palmer moisture anomaly index in the east of Northwest China. J Appl Meteor Sci, 2008, 19(3): 342-349.

Citation:

Wang Yue, Jiang Zhihong, Zhang Qiang, et al. Evaluating aridity and wetness of the wheat with Palmer moisture anomaly index in the east of Northwest China. J Appl Meteor Sci, 2008, 19(3): 342-349.

Wang Yue, Jiang Zhihong, Zhang Qiang, et al. Evaluating aridity and wetness of the wheat with Palmer moisture anomaly index in the east of Northwest China. J Appl Meteor Sci, 2008, 19(3): 342-349.

Citation:

Wang Yue, Jiang Zhihong, Zhang Qiang, et al. Evaluating aridity and wetness of the wheat with Palmer moisture anomaly index in the east of Northwest China. J Appl Meteor Sci, 2008, 19(3): 342-349.

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Evaluating Aridity and Wetness of the Wheat with Palmer Moisture Anomaly Index in the East of Northwest China

1.
Key Laboratory of Meteorological Disaster of Jiangsu Province, Nanjing University of Information Science & Technology, Nanjing 210044
2.
Climate Center of Shaanxi Province, Xi'an 710015
3.
National Climate Center, Beijing 10008
4.
Shaanxi Provincial Meteorological Service Observatory for Economic Crops, Xi'an 710015
5.
Weather Observatory of Jiangsu Province, Nanjing 210044
6.
Xi'an Meteorological Office, Xi'an 710016

Received Date: 2007-08-23
Rev Recd Date: 2008-02-20
Publish Date: 2008-06-30

Abstract

Abstract

Considering the lack of agriculture drought index in China, Palmer moisture anomaly index is introduced. Taking example for Yan'an, theoretical formula and physical meaning of Palmer moisture anomaly index is described. Using the method, the monthly Palmer moisture anomaly indexes of twenty wheat observation stations, such as Yan'an, Wuwei, Jingtai, Xining, Guide, Lanzhou etc, from 1961 to 2000 are calculated in the east of Northwest China, and the aridity and wetness of different period of growth for wheat are evaluated. The calculation of Palmer moisture anomaly index values is based on a supply and demand model of the soil moisture at a location. In addition to the current precipitation, air temperature, available water holding capacity (C_WA), some factors derived from water balance equation are considered such as potential evapotranspiration, potential recharge, potential runoff, potential loss, surface soil moisture content, and underlying soil moisture content. Factors of several previous months are based on to establish each Palmer moisture anomaly index value. It shows that the method of Palmer moisture anomaly index is more reasonable to study the flood or drought of different period of wheat growth in the east of Northwest China. The extent of drought and flood event of different periods of wheat growth can't be objectively assessed by Z-index. The difference of years with same precipitation and different temperature and C_WA can't be distinguished. Palmer moisture anomaly index in comparison with others is a good indication of the severity and extent of flood/drought event and of more objective classification of them, which is therefore quite applicable to an extended area. All these show that Palmer moisture anomaly index is more objective than Z-index for analysis on aridity and wetness in different period of wheat growth, and more accords with the results of analysis on aridity and wetness of the wheat in different period of growth. Analysis shows that Palmer moisture anomaly index can be the analysis tool of agriculture aridity and wetness in semiarid and semi-wetness regions in the east of Northwest China.
- the east of Northwest China;
- Palmer moisture anomaly index;
- the wheat;
- evaluation of aridity and wetness

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References(26)

Figures and Tables

图 1 延安市丰歉典型年I_PMA, Z指数对应的旱涝等级和月降水量P变化曲线

(实心柱形:I_PMA; 空心柱形:Z指数; 折线:P)

Fig. 1 The monthly flood/drought grades of I_PMA and Z index, and the monthly change curve of precipitation for Yan'an typical years

(solid columniation:I_PMA; hollow columniation:Z; solid line:P)

DownLoad: Full-Size Img PowerPoint

图 2 延安市1983年I_PMA和Z对应的旱涝等级及降水月际变化曲线

Fig. 2 The monthly flood/drought grades of I _PMA and Z index, and the monthly precipitation for Yan'an

DownLoad: Full-Size Img PowerPoint

表 1 西北地区东部所选站点及其相应的地理位置

Table 1 The information about selected stations in the east of Northwest China

表 2 I_PMA值, Z指数^[19]值及其相应的旱涝型

Table 2 Values of I _PMA and Z index as well as type of drought and flood

表 3 延安I_PMA旱涝评估结果

Table 3 Evaluated results of flood/drought for I_PMA in Yan'an

表 4 延安各水分平衡分量逐月平均值 (单位:mm)

Table 4 The monthly averaged water balance values over the historical record for Yan'an (unit:mm)

表 5 延安各月水分平衡各分量的气候系数值

Table 5 The monthly values of four water balance coefficients for Yan'an

表 6 干湿权重因子及气候特征权重因子

Table 6 Weighting factor K for dryness/wetness and K′ for climatic characteristic

表 7 延安1982年7月-1983年6月水分平衡各分量计算结果 (单位:mm)

Table 7 The monthly values of each water balance variable for Yan'an from July 1982 to June 1983 (unit:mm)

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