A dataset provided by the European Space Agency

Name OT1_thencren_1
Title The latitudinal and seasonal variations of D/H and O2 on Mars
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342235020&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342235060&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342235077&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342245624&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342246016&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342246341&instrument_name=HIFI&product_level=LEVEL0&compress=true

DOI https://doi.org/10.5270/esa-joe2ei1
Author encrenaz, t.
Description We propose to use HIFI to determine latitudinal and seasonal
variations of HDO, H2-18O, O2 and CO on Mars.
The water data will be used to retrieve the D/H ratio and
study its variations with latitude and season.
The martian D/H ratio, presently poorly known,
is a an important parameter as its excess on Mars
(about 5 times the terrestrial value) is interpreted as
the signature of an early outgassing of the martian
atmosphere. In addition, models predict a possible
variation of D/H with latitude and season, as an effect
of condensation processes and surface/atmosphere
interactions. The O2 and CO data will be used to study
the cycle of these two non-condensible species as a
function of the solar longitude. Results will be compared
with climate models which predict significant variations
of all these species. Our data will provide important
constraints to photochemical models. H2O is known to be
maximum at high northern latitudes during northern
summer, while CO and O2 are expected to be maximum
at high southern latitudes at the same time. Some CO
variations have been observed in the infrared but not
in the millimeter/submillimeter range so far. No
information is presently known about the possibile
variations of O2. Herschel is unique in its capability
to observe O2 and H2O.
We propose to observe Mars in three positions
(North, Center and South) at two different seasons,
with Ls close to 50 deg. and 120 deg. respectively.
We will use AOT II-2 mode (raster scan with DBS)
limited to 3 points. We have chosen high-frequency
transitions to get the maximum spatial resolution.
We propose to observe 3 settings: (1) H218O and HDO
around 1630 GHz, (2) O2 and HDO around 1815 GHz
and (3) 13CO and C18O around 1867 GHz.
The total observing time is 26.3 hours.
Publication
Instrument HIFI_HifiMapping_raster
Temporal Coverage 2011-12-22T03:05:43Z/2012-05-25T06:31:45Z
Version SPG v14.1.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2012-11-25T00:37:03Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, encrenaz, t., 2012, OT1_thencren_1, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-joe2ei1