The implications of geography and climate on drought trend

Abstract

ABSTRACT:The implications of geographical factors (i.e. elevation, freshwater area, urbanization, and proximity to coast) and climatic factors (i.e. air temperature, wind speed, relative humidity, and solar radiation) with regard to drought trend were investigated by analyzing the monthly averaged daily climate data (i.e. precipitation, temperature, wind speed, relative humidity, and solar radiation) recorded from 1973 to 2006 at 53 climatological stations in South Korea. In addition, geographical characteristics were identified by GIS analysis and land cover data were analyzed for these 53 stations. Further, multivariate regression analyses were performed by setting the Standardized Precipitation Index (SPI) trend as the dependent variable and the geographical and climatic factors as the independent variables. The results indicated that, overall, the droughts in South Korea are becoming more severe in spring for the short-and seasonal term; however, the droughts in all seasons are becoming less severe for the long term. The effects of geographical and climatic factors on drought trends are also closely related to seasonality and drought duration for short-, seasonal-, and medium-term droughts, but not for long-term droughts. Therefore, for efficient water resources management for drought preparedness, drought duration and seasonality should also be considered along with geographical and climatic characteristics of a region.

Detecting dry matter yield trend of whole crop maize considering the climatic factors in the Republic of Korea

“…Furthermore, drought occurring at maize‐flowering period reported to pose greater losses than when it occurs at other developmental stages (Grant, Jackson, Kiniry, & Arkin, ). In Korea, trends of severe drought during April to May has been indicated (Rim, ), and these climatic events coincides with the seeding time of maize in the country, and found to be detrimental for yield of maize crops.…”

Assessment of Spatial Agglomeration of Agricultural Drought Disaster in China from 1978 to 2016

“…China is an agricultural country that is easily affected by natural hazards 45 . There are four types natural disasters occur in China, which is drought disaster, flood disaster, wind disaster and low temperature freezing disaster.…”

Spatial and Temporal Characteristics of Meteorological Drought in Shandong Province, China, from 1961 to 2008

“…As a primary method for assessing the effect of drought, the drought index is a numerical expression of drought parameters, such as intensity, severity, duration, and spatial extent. Many indices have been developed so far to quantify a drought among which some meteorological drought indices have been implemented widely at present, such as the standardized precipitation index (SPI) [15][16][17], Palmer drought severity index (PDSI) [18,19], and vegetation condition index (VCI) [20,21]. Recently, the meteorological drought composite index (CI), which was proposed by China Meteorological Administration, has been used in many regions in China.…”