대기 (Atmosphere)

  • 제25권1호
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  • Pages.185-191
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  • 2015
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  • 1598-3560(pISSN)
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  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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광음향 및 네펠로미터 방식을 이용한 에어로졸 흡수 및 산란계수 측정

Aerosol Light Absorption and Scattering Coefficient Measurements with a Photoacoustic and Nephelometric Spectrometer

  • 김지형 (서울대학교 지구환경과학부) ;
  • 김상우 (서울대학교 지구환경과학부) ;
  • 허정화 (서울대학교 지구환경과학부) ;
  • 남지현 (서울대학교 지구환경과학부) ;
  • 김만해 (서울대학교 지구환경과학부) ;
  • 유영석 (기상청 기후변화감시센터) ;
  • 임한철 (기상청 기후변화감시센터) ;
  • 이철규 (기상청 기후변화감시센터) ;
  • 허복행 (기상청 기후변화감시센터) ;
  • 윤순창 (서울대학교 지구환경과학부)
  • Kim, Ji-Hyoung (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Sang-Woo (School of Earth and Environmental Sciences, Seoul National University) ;
  • Heo, Junghwa (School of Earth and Environmental Sciences, Seoul National University) ;
  • Nam, Jihyun (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Man-Hae (School of Earth and Environmental Sciences, Seoul National University) ;
  • Yu, Yung-Suk (Korea Global Atmosphere Watch Center, Korea Meteorological Administration) ;
  • Lim, Han-Chul (Korea Global Atmosphere Watch Center, Korea Meteorological Administration) ;
  • Lee, Chulkyu (Korea Global Atmosphere Watch Center, Korea Meteorological Administration) ;
  • Heo, Bok-Haeng (Korea Global Atmosphere Watch Center, Korea Meteorological Administration) ;
  • Yoon, Soon-Chang (School of Earth and Environmental Sciences, Seoul National University)
  • 투고 : 2014.12.23
  • 심사 : 2015.02.08
  • 발행 : 2015.03.31
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초록

고산기후관측소에서 2008년 8월과 9월의 Cheju ABC Plume Monsoon Experiment (CAPMEX) 기간 동안 3파장 photoacoustic soot spectrometer (PASS)로 측정된 에어로졸 흡수계수(${\sigma}_a$)와 에어로졸 산란계수(${\sigma}_s$)를 기존의 연구에서 널리 사용되고 있는 aethalometer 및 nephelometer의 동시관측 결과와 비교하였다. PASS ${\sigma}_a$의 관측결과는 aethalometer ${\sigma}_a$와 시간 변화 경향성이 매우 잘 일치했으나, 532 nm의 경우 절대값 면에서 PASS ${\sigma}_a$가 약 53% 큰 값을 보여 다소 차이가 있음을 알 수 있었다. PASS ${\sigma}_s$의 관측결과는 nephelometer ${\sigma}_s$와 비교했을 때, 근소한 차이로 매우 잘 일치함을 확인하였다(Bias Difference: $13.6Mm^{-1}$). 대기 중의 상대습도(RH)가 증가함에 따라 ${\sigma}_a$보다는 ${\sigma}_s$에 대한 영향이 큰 것으로 사료된다. Nephelometer ${\sigma}_s$와 PASS ${\sigma}_s$의 비율은 상대습도가 증가할수록 명확히 증가하는 경향성을 보였다. 이는 RH가 증가함에 따라서 PASS의 ${\sigma}_s$가 nephelometer ${\sigma}_s$에 비해서 상대적으로 감소하였음을 의미하며, 이러한 경향성은 RH가 70~80%를 넘어서면서 차이가 더욱 두드러지게 나타났다. Nephelometer와 aethalometer의 ${\sigma}_a$ 및 ${\sigma}_s$ 관측 결과 보다 PASS의 측정 결과로부터 산출한 $A{\AA}E$와 $S{\AA}E$가 더 크게 나타났다.

Ambient measurements of aerosol light absorption (${\sigma}_a$) and scattering coefficients (${\sigma}_s$) were done at Gosan climate observatory during summer 2008 using a 3-wavelength photoacoustic soot spectrometer (PASS). PASS was deployed photoacoustic method for light absorption and integrated nephelometry for light scattering measurements. The ${\sigma}_a$ and ${\sigma}_s$ from PASS were compared with those from co-located aethalometer and nephelometer measurements. The aethalometer measurements of ${\sigma}_a$ correlated reasonably well with photoacoustic measurements, but the slope of the linear fitting line indicated the PASS measurement values of ${\sigma}_a$ were larger by a factor of 1.53. The nephelometer measurement values of ${\sigma}_s$ correlated very well with PASS measurements of ${\sigma}_s$, with a slope of 1.12 and a small offset. Comparing to the aethalometer measurements, the photoacoustic measurements of ${\sigma}_a$ didn't exhibit a significant (i.e., the ratio between aethalometer and PASS increased) change with increasing relative humidity (RH). The ratio of ${\sigma}_s$ between nephelometer and PASS increased with increasing RH, especially when the RH increased beyond 80%. This apparent increase in ${\sigma}_s$ with RH may be due to the contribution of hygroscopic growth of aerosols.

키워드

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