Evaluation of suitable spectral intervals for near-IR laboratory detection of water vapour continuum absorption

Article English OPEN
Ptashnik, I. V. (2007)

The water vapour continuum absorption is an important component of molecular absorption of radiation in atmosphere. However, uncertainty in knowledge of the value of the continuum absorption at present can achieve 100% in different spectral regions leading to an error in flux calculation up to 3-5 W/m2 global mean. This work uses line-by-line calculations to reveal the best spectral intervals for experimental verification of the CKD water vapour continuum models in the currently least studied near-infrared spectral region. Possible sources\ud of errors in continuum retrieval taken into account in the simulation include the sensitivity of laboratory spectrometers and uncertainties in the spectral line parameters in HITRAN-2004 and Schwenke-Partridge database. It is shown that a number of micro-windows in near-IR can\ud be used at present for laboratory detection of the water vapour continuum with estimated accuracy from 30 to 5%.
  • References (24)
    24 references, page 1 of 3

    1. Clough SA, Kneizys FX, Davies RW. Line shape and water vapour continuum. Atmos Res 1989; 23:229-241.

    2. Mlawer EJ, Clough SA, Brown PD, Tobin DC. Recent developments in the water vapour continuum. Ninth ARM Science Team Meeting Proceedings, March 22-26, 1999, San Antonio, TX, p.1-6.

    3. Mlawer EJ, Tobin DC, Clough SA. A revised perspective on the water vapour continuum: The MT_CKD model. JQSRT, in preparation.

    4. Zhong W, Haigh JD, Belmiloud D, Schermaul R, Tennyson J. Note on 'The impact of new water vapour spectral line parameters on the calculation of atmospheric absorption'. QJR Meteorol Soc 2002;128:1387-1388.

    5. Ptashnik IV, Shine KP. Calculation of solar radiative fluxes in the atmosphere: the effect of updates in spectroscopic data. Atmos Oceanic Opt 2003;16(3):251-255.

    6. Fomin BA, Udalova TA, Zhitnitskii EA. Evolution of spectroscopic information over the last decade and its effect on line-by-line calculations for validation of radiation codes for climate models. JQSRT 2004;86:73-85.

    7. Birch DE, Alt RL. Continuum absorption in the 700-1200 cm-1 and 2400-2800 cm-1 windows. Rep. AFGL-TR-84-0128 (U.S. Air Force Geophysics Laboratory), 1984.

    8. Tobin DC, Strow LL, Lafferty WJ, Olson WB. Experimental investigation of the self- and N2-broadened continuum within the ν2 band of water vapour. Appl Opt 1996;35:4724- 4734.

    9. Han Y, Shaw JA, Churnside JH, Brown PD, Clough SA. Infrared spectral radiance measurements in the tropical Pacific atmosphere. J Geophys Res 1997;102:4353-4356.

    10. Tobin DC, Best FA, Brown PD, Clough SA, Dedecker RG, Ellingson RG, Garcia RK, Howell HB, Knuteson RO, Mlawer EJ, Revercomb HE, Short JF, van Delst PF, Walden VP. Down-welling spectral radiance observation at SHEBA ice station: Water vapour continuum measurements from 17-26 μm. J Geophys Res 1999;104: 2081-2092.

  • Metrics
    views in OpenAIRE
    views in local repository
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    Central Archive at the University of Reading - IRUS-UK 0 17
Share - Bookmark