Applicability Evaluation of Drought Indices in Northern China and the Reasons for Their Differences

Suping WANG; Jinsong WANG; Qiang ZHANG; Yiping LI

doi:10.7522/j.issn.1000-0534.2019.00049.

Plateau Meteorology >

2020 , Vol. 39 >Issue 3: 628 - 640

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00049.

Applicability Evaluation of Drought Indices in Northern China and the Reasons for Their Differences

Suping WANG ,
Jinsong WANG ,
Qiang ZHANG ,
Yiping LI

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1.College of Atmospheric Science, Lanzhou University, Lanzhou 730000, Gansu, China;2.Institute of Arid Meteorology, China Meteorological Administration/ Key Laboratory of Arid Climate Change and Disaster Reduction, China Meteorological Administration/Key Laboratory of Arid Climatic Change and Disaster Reduction, Gansu Province, Lanzhou 730020, Gansu, China;3.Gansu Provincial Meteorological Bureau, Lanzhou 730020, Gansu, China

Received date: 2019-02-16

Online published: 2020-06-28

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Abstract

Drought monitoring is an essential component of drought research.It is normally performed using various drought indices.A number of drought indices have been introduced and applied in different regions.But some of those are region specific and have limitations of applicability in other climatic conditions.Based on daily meteorological data from 267 weather stations and soil relative humidity of 20 cm from 3 agrometeorological sites, the applicability of five drought indices include in MCI、 K、 SPI、 SPEI and Pa in Northern China were evaluated and the reasons for the difference of the monitoring results were discussed.The results showed that for the ability of drought monitoring, MCI and K indices have the best performances.MCI is particularly advantageous in spring in the study area.K index is slightly better than MCI in the easterly and southerly regions in summer, autumn and winter.Pa and SPI index performance well in summer and autumn, and SPEI do best in summer.The low monitoring accuracy of Pa, SPI and SPEI is mainly due to the light monitoring of these indexes or the high frequency of missing, while the K index also has a high frequency of missing in spring in the northeast region, up to 29%.The monitoring ability of various drought indexes is closely related to the drought factors and their time scales which are considered respectively.Taken together, MCI and K are better than other indices in the study area.

Key words： Drought indices; drought monitoring; applicability; differences; Northern China

Cite this article

Suping WANG , Jinsong WANG , Qiang ZHANG , Yiping LI . Applicability Evaluation of Drought Indices in Northern China and the Reasons for Their Differences[J]. Plateau Meteorology, 2020 , 39(3) : 628 -640 . DOI: 10.7522/j.issn.1000-0534.2019.00049.

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