HR: 1340h
AN: H23D-1164 [Abstracts]
TI: Latitudinal Distribution of the Deuterium to Hydrogen Ratio in the Atmospheric Water Vapor Retrieved
From Space FTS Data
AU: * Imasu, R
EM: imasu@ccsr.u-tokyo.ac.jp
AF: Center for Climate System Research, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904
Japan
AU: Saikawa, S
EM: saikawa@ccsr.u-tokyo.ac.jp
AF: Center for Climate System Research, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904
Japan
AU: Zakharov, V I
EM: vz@uraltc.ru
AF: Global Ecology & Remote Sensing Laboratory, Department of Physics, The Ural State University, 51 Lenin
Ave., Ekaterinburg, 620083
Russian Federation
AU: Gribanov, K G
EM: kgribanov@remotesensing.ru
AF: Global Ecology & Remote Sensing Laboratory, Department of Physics, The Ural State University, 51 Lenin
Ave., Ekaterinburg, 620083
Russian Federation
AU: Hoffmann, G
EM: hoffmann@lsce.saclay.cea.fr
AF: IPSL/Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA-CNRS, 1572 CE Saclay, Orme des
Merisiers, Gif sur Yvette, 91191
France
AU: Jouzel, J
EM: jouzel@lsce.saclay.cea.fr
AF: IPSL/Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA-CNRS, 1572 CE Saclay, Orme des
Merisiers, Gif sur Yvette, 91191
France
AB:
Latitudinal distribution of the columnar deuterium/hydrogen ratio of atmospheric water vapor, dD, was firstly retrieved from
high-resolution infrared spectra observed from space (Zakharov et al., 2004: doi:10.1029/2004GL019433). A Fourier Transform
Spectrometer (FTS) sensor, Interferometric Monitor for Greenhouse gases (IMG), aboard the ADvanced Earth Observing Satellite
(ADEOS) observed the thermal infrared spectra over the ocean during the sensor operational period from December 1996 through
June 1997. We analyzed these spectrum data to obtain the dD values based on a type of spectral fitting method using a
forward/retrieval calculation code developed by Gribanov et al. [2001]. The results show that the latitudinal mean dDŸnwas
relatively large with values around V100 permillage in the tropical region decreasing down to minimal values of V800
permillage at high latitudes. These data were plotted against the sea surface temperature at which the spectra were observed,
and we discussed the deuterium fractionation processes occurred during the evaporation, condensation, and transport of the
water vapor comparing with the dD values from a simple two-phase distillation model. Also investigated were the synoptic
scale situations at which some typical dD data were observed. Water vapor transport around the synoptic scale systems were
discussed based on the trajectory analyses of the air mass in which the dD values were observed. The data analysis method
adopted in this study is expected to be applicable for data analyses of satellite sensors such as IASI and TES which have
almost the same performance as IMG.
DE: 4870 Stable isotopes
DE: 6062 Satellites
DE: 1655 Water cycles (1836)
DE: 1040 Isotopic composition/chemistry
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting