KOPRI Repository

The observed relationship of cloud to surface longwave radiation and air temperature at Ny-Alesund, Svalbard

Cited 6 time in wos
Cited 8 time in scopus
Metadata Downloads
The observed relationship of cloud to surface longwave radiation and air temperature at Ny-Alesund, Svalbard
Other Titles
스발바드 니알슨에서 관측된 지표 장파복사와 기온과의 관계
Yeo, Huidong
Park, Sangjong
Kim, Baek-Min
Shiobara, Masataka
Kim, Sang-Woo
Kwon, Hataek
Kim, Joo-Hong
Jeong, Jee-Hoon
Park, Sang Seo
Choi, Taejin
Meteorology & Atmospheric Sciences
Arctic clouds; Ny-angstrom lesund; cloud base height; cloud fraction; longwave radiation
Issue Date
Huidong Yeo, et al. 2018. "The observed relationship of cloud to surface longwave radiation and air temperature at Ny-Alesund, Svalbard". TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY, 70(1): 1450589-NaN.
Ten-year (2004-2013) observations of cloud and surface shortwave (SW) and longwave (LW) fluxes at Ny-angstrom lesund were analysed to investigate monthly variations in cloudiness and their impacts on the surface LW radiation budget and near-surface temperature (T-s). The cloud fraction (CF) showed distinct monthly variations, high in summer (0.90) and lower in winter (0.79). The downward SW flux increased from March and showed a peak (similar to 200Wm(-2)) in June. In contrast, the downward LW (LWD) flux increased from similar to 200Wm(-2) in February to similar to 300Wm(-2) in July. Both LWD and upward LW (LWU) fluxes and their difference increased during winter as lowest cloud base height (LCBH) decreased and CF increased. T-s difference and both LW fluxes difference (LWD and LWU), calculated as the difference in monthly mean T-s and LW between all-sky and cloud-free conditions, were highly correlated (R-2=0.68 for LWD and R-2=0.92 for LWU). Dramatic changes in T-s, CF and LW fluxes at Ny-angstrom lesund were closely associated with cold and warm air mass advection on a multi-day time scale. The average T-s under low-level clouds (LCBH 2km) was estimated as -7.4 +/- 6.1 degrees C due to warm air masses advected from the North Atlantic Ocean and Barents Sea, whereas the average T-s on cloud-free days was -14.5 +/- 5.7 degrees C because of cold air mass advection from the pole. However, the duration of low-level clouds may not be long enough to drive such large T-s variations. 75-percentile of low-level cloud conditions at Ny-angstrom lesund persisted up to 2.3days, whereas cloud-free and high-altitude cloud (LCBH>2km) conditions lasted for approximately 0.8 and 0.5days, respectively. This implies that cloud LW effects on several warm days may be larger than the monthly average, but may not be accumulated enough to induce surface warming due to abrupt T-s drop associated with cold air mass advection.
Files in This Item
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.