[논문]복사전달모델을 이용한 GEMS 일산화브로민 산출 민감도 시험

정희성; 김준; 정욱교; 박상서; 홍재민; 안다현; 차혜지; 이원진; 이혜정

doi:10.7780/kjrs.2021.37.6.1.1

복사전달모델을 이용한 GEMS 일산화브로민 산출 민감도 시험
GEMS BrO Retrieval Sensitivity Test Using a Radiative Transfer Model 원문보기

대한원격탐사학회지 = Korean journal of remote sensing, v.37 no.6 pt.1, 2021년, pp.1491 - 1506

정희성 (연세대학교 대기과학과) , 김준 (연세대학교 대기과학과) , 정욱교 (메릴랜드대학교 지구시스템과학융합센터) , 박상서 (울산과학기술원 도시환경공학과) , 홍재민 (연세대학교 대기과학과) , 안다현 (연세대학교 대기과학과) , 차혜지 (연세대학교 대기과학과) , 이원진 (국립환경과학원 환경위성센터) , 이혜정 (국립환경과학원 환경위성센터)

초록
AI-Helper

GEMS의 복사 실측 자료로부터 일산화브로민(BrO) 전량 농도를 산출하기에 앞서, 복사전달모델로부터 생성된 모의자료를 이용하여 민감도 시험을 수행하였다. 산출 오차가 갖는 월간 및 일내 변동성을 고려하기 위해, 2013년 7월-2014년 6월 기간 매달 첫째 날의 00-07 UTC에 대해 한 시간 간격의 모의자료를 구성하였다. 최적추정법을 통해 계산된 산출물의 해답 오차는 대기질량인자 증가에 따라 감소하는 반비례 경향을 주로 보였지만, 대기질량인자 값이 5 이상으로 크게 나타나는 범위에서는 비례 경향을 보였다. BrO와 포름알데히드(HCHO) 흡수선 간의 중첩으로 인해 발생하는 BrO 산출물의 간섭 오차는 BrO의 대기질량인자가 작을수록 크게 나타났다. 해답 오차와 간섭 오차의 추정치를 결합하여 계산한 산출물 최종 오차의 평균값은 모든 데이터 샘플에 대해 26.74±30.18%로, 80° 이상의 태양천정각을 갖는 샘플에 대해 60.39±133.78%로 나타났다. 본 연구에서 고려되지 않은 간섭 스펙트럼 및 복사 측정의 오차로 인해, 실제 GEMS의 BrO 산출물이 갖게 될 오차는 추정치와 절대값의 차이를 나타낼 가능성이 있다. 그러나 본 연구에서 제시한 오차 요소들의 변동 특성들은 실제 산출물에서도 나타날 것이다.

Abstract ▼ AI-Helper

To estimate errors in GEMS retrievals for bromine monoxide (BrO) total vertical column densities(VCDs), we perform a sensitivity test using synthetic spectra generated by a radiative transfer model. Hourly synthetic data are produced for 00-07 UTC on the first day of every month in Jul 2013- Jun 2014. Solution errors estimated by the optimal estimation method tend to decrease with increasing air mass factors (AMFs) but increase when AMFs are larger than 5. Interference errors induced by formaldehyde (HCHO) absorption appear to be larger with smaller BrO AMFs. Total BrO retrieval errors estimated by combining solution and interference errors show an average of 26.74±30.18% for all data samples and 60.39±133.78% for those with solar zenith angles higher than 80°. Due to interfering spectral features and measurement errors not considered in thisstudy, errorsin BrO retrievals from actual GEMS measurements may have different magnitudes from our estimates. However, the variability of errors assessed in this study is still expected to appear in the actual BrO retrievals.

주제어

표/그림 (9)

그림 Fig. 1. Daily averages of total BrO VCDs from G5NR-chem for (a) Jan 1, 2014, (b) Apr 1, 2014, (c) Jul 1, 2013, and (d) Oct 1, 2013.
그림 Fig. 2. GEMS SNR averaged over the spectral range of 326-356 nm for (a) 00 UTC, (b) 02 UTC, (c) 04 UTC, and (d) 06 UTC on Jan 1, 2014. The SNR values are estimated without 2-pixel binning.
그림 Fig. 3. Solar zenith angles (SZAs) at (a) 00 UTC, (b) 02 UTC, (c) 04 UTC, and (d) 06 UTC on Jan 1, 2014.
그림 Fig. 4. Solution errors of total BrO VCD retrievals from GEMS, estimated for (a) 00 UTC, (b) 02 UTC, (c) 04 UTC, and (d) 06 UTC on Jan 1, 2014.
그림 Fig. 5. (a) Scattering weights and shape factors from three arbitrary grid points at 00 UTC on Jan 1, 2014. The SZAs, VZAs, and SNRs at the three locations are inset; (b) Scattering weights at 341 nm for 30 km and 2 km altitudes. The scattering weights in this panel are from all grid points at 00 UTC on Jan 1, 2014; (c) SNRs and BrO AMFs from all grid points at 00 UTC on Jan 1, 2014.
그림 Fig. 6. The dependencies of solution errors on (a) SZAs, (b) VZAs, (c) BrO AMFs, and (d) inverse ofBrO AMFs.
그림 Fig. 7. (a) Standard deviations of HCHO total VCDs; (b) Interference errors for 06 UTC on Jan 1, 2014, induced by an overlap between HCHO and BrO spectral features; (c) Interference errors for 00-07 UTC on the first days of every month from Jul 2013 to Jun 2014; (d) Same as panel (c) but with the colors representing BrO AMFs.
그림 Fig. 8. The dependencies of retrieval errors on (a) BrO AMFs, (c) Inverse of BrO AMFs, and (e) BrO VCDs. Panels (b, d, and f) show percentage errors with the same x-axes as panels (a, c, and e), respectively. The colors of panels (a, c, and e) represent standard deviations of HCHO VCDs. The enlarged views of panels (d and f) are inset.
표 Table 1. Mean values and standard deviations of BrO retrieval errors as functions of the ranges of VZAs, SZAs, and BrO VCDs

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