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RISS 인기검색어
- 검색키워드
- 저자 : Aly I. El-Kadi (검색결과 2 건)
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Temporal and spatial variability of rainfall and climate trend on Jeju Island
Alan Mair,Aly I. El-Kadi,하규철,Gi-Won Koh 한국지질과학협의회 2013 Geosciences Journal Vol.17 No.1
The temporal and spatial analyses of rainfall and temperature were conducted for understanding spatial variability and climate trend on Jeju Island. Rainfall data from 1992 to 2009 were used for the spatial analyses, and missing data were adjusted on Mt. Halla and along the northeast coast to reduce uncertainty of spatial variability. In addition, rainfall time series data of both Jeju City and Seogwipo City from 1961 to 2009 were analyzed for a long-term trend and identification of droughts. Mean annual rainfall for the period 1992–2009 shows an area of maximum rainfall centered around Mt. Halla where maximum annual rainfall reaches more than 4,300 mm and mean island rainfall is 2,082 mm. Upward trends in rainfall intensity, magnitude, and dryness conditions at the Jeju City and Seogwipo City from 1961 to 2009 suggest that rainfall has intensified with greater quantities of rainfall occurring over shorter durations, with longer dry periods between storm events. The annual cycle shows a distinct monsoon signature with peak rainfall typically occurring in August. Rainfall seasonality shows a shift in peak rainfall from June, July, and August, to July, August, and September. The most severe droughts in the period 1961–2009 were identified using a 12-month composite SPI. Three severe droughts each lasting around two years were identified over a relatively short nine-year period from 1964–1972.
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Benjamin Hagedorn,Alan Mair,Suzanne Tillery,Aly I. El-Kadi,하규철,고기원 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.4
Volcanic islands can be characterized by remarkablesurface air temperature variability. The distribution of weather stationsin these settings, however, is typically too sparse to reliably describetemperature patterns which can complicate regional-scale hydrologicanalyses. Here, a simple method is presented to estimate near surfaceair temperatures for such a setting (Jeju Island, Republic of Korea). The method utilizes temperature lapse rates (TLR; the change intemperature with elevation) which are computed for Tmin, Tave, andTmax for two distinct hemispheres: the more arid northern flanksand the more humid southern flanks of the central orographicdivide. Computed TLRs vary greatly with season and location relativeto the orographic divide and, unlike in continental mountainoussettings, are generally highest for Tmin in winter. Cross-validationresults indicate a good match between modeled and measuredvalues particularly for high altitude stations that are characterizedby highest precipitation rates. Because temporally changing TLRsperform better than the often applied theoretical constant environmentallapse rate of 6.5 °C/km, monthly mean TLRs compiled fromtemperature data from Jeju Island are presented here as proxiesfor surface air temperature simulation efforts in similar settingsfor which only limited climatic data are available.
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