Radiation observation at Dome Fuji Station, Antarctica

Transcript

1 170 Scientific Note + Radiation observation at Dome Fuji Station Antarctica Naohiko Hirasawa and Koji Fujita + ** ; **2 / 1 Abstract: This paper reports radiation observations at Dome Fuji Station from February + **- to January * ** carried out by the th Japanese Antarctic Research Expedition team The radiometers which measured the upward longwave radiation (LWu) the downward longwave (LWd) and the downward shortwave (SWd) were equipped with fans to avoid frosting on the surface of the radiometer dome by air circulation The upward shortwave radiation (SWu) measured by a radiometer without fan needs correction which we leave as a problem for the future In addition as for LWd and LWu in the polar night a typical radiational cooling case and a suppressed radiational cooling one are shown : **- + ** + * **- + ** + * 11 +3S -3 E -2+* m National Institute of Polar Research Research Organization of Information and Systems Kaga + -chome Itabashi-ku Tokyo /+/ Graduate School of Environmental Studies Nagoya University Furocho Chikusa-ku Nagoya 0-20*+ Corresponding author hiran@nipracjp Vol / +1* +2+ **2 Nankyoku Shiryô (Antarctic Record) Vol / Special Issue +1* +2+ **2 **2 National Institute of Polar Research

2 171 + Fig + The Antarctic continent and Dome Fuji Station The elevation is shown by contours Yamanouchi et al ** S +*0 / E -* m / S * -* E -0 m +301 Kuhn et al +311 Yamanouchi et al ** ms **

3 172 + Table + The radiometers and the calibration coe$ cient + -** nm 2** nm - mm /* mm V mv: + S mv kw m + R kwm R VmV kwm + SmV kwm Yamanouchi et al +32+ Yamanouchi +32- * * * 3 +* * 1/ MS2*+ F MS2*+ MS2*+ SW MS2*+ MS2* * / +* + / ++ + / * sw

4 173 a 3 + / b +* + / c ++ + / Fig Time series of shortwave radiation observed for (a) September +/ (b) October +/ and (c) November + / MS2*+

5 / ** V mv + S mvkwm R kwm VmV kwm SmV kwm R R lw-net R R lw-out R - lw-in R lw-net lw-net lw-out R R R lw-net lw-in lw-out lw-in R R s T - lw-in lw-net S T s / * Wm K s - R lw-in + K Rlw-in-corrRlw-nets TS K TS TD K TS T D Rlw-nets TS + T T Correction D ratio of dome e# ect: K TS TD TS +** + - / - a / / 1 -* -+ *1 + -b / S 2

6 175 - Correction ratio of dome e# ect: +** K TS TD TS + a / b + Fig - Time series of correction ratio of dome e# ect ( +** K (TS T D )/T S ) (a) for the first +* days of May (b) for the last ++ days of December + +* + - / 2 +/ SWu SWd

7 176 **- + ** + * Fig Time series of daily mean values of radiation terms at Dome Fuji Station from the + st of February **- to the * th of January ** The downward shortwave (SWd: red line) the upward shortwave (SWu: pink line) the net shortwave (SWnet: red open circles) the downward longwave (LWd: sky blue line) the upward longwave (LWu: blue line) and the net longwave radiation (LWnet: blue open circles) are shown + 1* Wm ** Wm * / +* SWuSWd / + + * 2/ LWu LWd + + ** Wm 3 +** Wm LWuLWd

8 177 / SWuSWd+** Fig / Time series of reflectivity of shortwave radiation ((SWu/SWd) +** )( ) 0 Fig 0 Time series of TBB of LWu and LWd and surface air temperature /* Wm / Wm Hirasawa et al *** 0 - +* ++ +

9 178 1 / Fig 1 Time series of LWu and LWd for the first +* days of May 1 / + 0 -* Wm / + - / 0 / a **- **- ** b * 1/ * 2 **- * 2/ **-

10 : : : **- : : Fig 2 Time series of SWu (thin red line) SWd (bold red line) and SWnet (red open circles) in +331 by JARE- -2 compared with those in **- (SWu: blue circles and SWd: black circles) * ** **- ** + *

11 180 3 ** Fig 3 Time series of longwave radiation for **- and * : / Hirasawa N Nakamura H and Yamanouchi T (***): Abrupt changes in meteorological conditions observed at an inland Antarctic station in association with wintertime blocking Geophys Res Lett ** : 3* p Kuhn M Kundla LS and Stroschein LA ( +311): The Radiation Budget at Plateau Station Antarctica

12 ed by JA Businger Washington DC Amer Geophys Union + 1- (Antarct Res Ser /) Yamanouchi T ( +32-): Variations of incident solar flux and snow albedo on the solar zenith angle and cloud cover at Mizuho station Antarctica J Meteor Soc Jpn Yamanouchi T Wada M Mae S Kawaguchi S and Tsukamura K ( +32+ ): Measurements of radiation components at Mizuho Station East Antarctuca in +313 Mem Natl Inst Polar Res Spec Issue Yamanouchi T Hirasawa N Hayashi M Shuhei T and Kaneto S (**-): Meteorological characteristics of Antarctic inland station Dome Fuji Mem Natl Inst Polar Res Spec Issue /1 3 +*