The Relationship Between Cloud Cover and Outgoing Longwave Radiation in the Southern of Vietnam
Main Article Content
Abstract
Abstract: Using 1,00×1,00 resolution data of the Outgoing Longwave Radiation (OLR) and the cloud cover from NCEP/NCAR during the 1981 – 2012 period, the relationship between the cloud cover and the OLR in the Southern of Vietnam was investigated by analyzing and comparing the spatial distribution, temporal evolution and their correlation. The results show that the characteristics of the spatial distribution and the year cycle of cloud cover and OLR are inversely correlated. The region or time that the cloud cover is great, the OLR is small and vice versa. In the Southern of Vietnam, the OLR value is largest (or smallest) in the dry (or rainy) season and in the El-Nino (La-Nina) years. In addition, during the 1981-2012period, the OLR in this region shows a downward trend about 3.6 W/m2/decade, while the cloud cover tends to increase by 0.2%/decade.
Keywords: Cloud cover, Outgoing Longwave Radiation, the Southern of Vietnam.
References:
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[13] https://www.esrl.noaa.gov/psd/data/gridded/data.noaa.hrc.html.
References
[2] Kousky, V. E. (1988), Pentad outgoing longwave radiation climatology for the South American sector, Revista Brasileira de Meteorologia., Vol.3, pp. 217–231.
[3] Gonzalez M., C. S. Vera (2007), The nature of the rainfall onset over central South America, Atmósfera, Vol.20(4), pp. 377-394.
[4] Bernard Fontaine, Samuel Louvet and Pascal Roucou (2008), Definition and redictability of an OLR based West African monsoon onset, International Journal of Climatology, Vol.13, pp. 1787-1798.
[5] Brant Liebmann and Carlos R. Mechoso (2010), The South American Monsoon System, The Global Monsoon System Research and Forecas, Vol.9, pp. 137-158.
[6] Prasad, S.D. Bansod andS.S. Sabade (2000), Forecasting Indian summer monsoon rainfall by outgoing longwave radiation over the Indian Ocean, International Journal of Climatology, Vol.20, pp. 105–114.
[7] Bansod.S.D (2004), Outgoing long-wave radiation over the Tropical Pacific and Atlantic Ocean and Indian summer monsoon rainfall, Theoretical and Applied Climatology, Vol. 77, pp. 185-193.
[8] Omogbai and J Hum Ecol (2010), An Empirical Prediction of Seasonal Rainfall in Nigeria, International Interdisciplinary Journal of Man-Environment Relationship, Vol.32(1), pp. 23-27.
[9] Ieyasu Takimoto and Jun Matsumoto (2004), Large-scale changes associate with the end of Baiu season in western Japan, ISMA, Vol. 87(1), pp.339-344.
[10] John L. Mcbride, Malcolm R. Haylock, and Neville Nicholls (2003), Relationships between the Maritime Continent Heat Source and the El Nino–Southern Oscillation Phenomenon, American Meteorological Society, Vol.16, pp. 2905-2914.
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[12] Chu Thị Thu Hường, Phan Văn Tân (2012), Mối quan hệ giữa nắng nóng và rét đậm trên lãnh thổ Việt Nam với bức xạ sóng dài đi xa, Tạp chí Khí tượng Thủy văn, Số 614, Tháng 2/2012, pp. 8-14.
[13] https://www.esrl.noaa.gov/psd/data/gridded/data.noaa.hrc.html.