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Resolución de 1 de octubre de 2024, de la Presidencia de la Agencia Estatal de Meteorología, por la que se publica el Convenio con la Comunidad de Castilla y León, en materia de meteorología y climatología
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Evaluation of total column water vapour products from satellite observations and reanalyses within the GEWEX Water Vapor Assessment
Get PDFSince 2011, the Global Energy and Water cycle Exchanges (GEWEX) Water Vapor Assessment (GVAP) has provided performance analyses for state-of-the-art reanalysis and satellite water vapour products to
the GEWEX Data and Analysis Panel (GDAP) and the user community in general. A significant component of
the work undertaken by G-VAP is to characterise the quality and uncertainty of these water vapour records to
(i) ensure full exploitation and (ii) avoid incorrect use or interpretation of results. This study presents results
from the second phase of G-VAP, where we have extended and expanded our analysis of total column water
vapour (TCWV) from phase 1, in conjunction with updating the G-VAP archive. For version 2 of the archive, we
consider 28 freely available and mature satellite and reanalysis data products, remapped to a regular longitude–
latitude grid of 2° × 2° and on monthly time steps between January 1979 and December 2019. We first analysed
all records for a “common” short period of 5 years (2005–2009), focusing on variability (spatial and seasonal)
and deviation from the ensemble mean. We observed that clear-sky daytime-only satellite products were generally drier than the ensemble mean, and seasonal variability/disparity in several regions up to 12 kg m−2
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to original spatial resolution and temporal sampling.This research has been supported by the Natural Environment Research Council (grant no. PR140015) and the European Space Agency (grant no. 4000131292)
Fiducial Reference Measurement for Greenhouse Gases (FRM4GHG)
Get PDFThe Total Carbon Column Observing Network (TCCON) and the InfraredWorking Group of
the Network for the Detection of Atmospheric Composition Change (NDACC-IRWG) are two groundbased
networks that provide the retrieved concentrations of up to 30 atmospheric trace gases, using
solar absorption spectrometry. Both networks provide reference measurements for the validation
of satellites and models. TCCON concentrates on long-lived greenhouse gases (GHGs) for carbon
cycle studies and validation. The number of sites is limited, and the geographical coverage is uneven,
covering mainly Europe and the USA. A better distribution of stations is desired to improve the
representativeness of the data for various atmospheric conditions and surface conditions and to cover
a large latitudinal distribution. The two successive Fiducial Reference Measurements for Greenhouse
Gases European Space Agency projects (FRM4GHG and FRM4GHG2) aim at the assessment of several
low-cost portable instruments for precise measurements of GHGs to complement the existing groundbased
sites. Several types of low spectral resolution Fourier transform infrared (FTIR) spectrometers
manufactured by Bruker, namely an EM27/SUN, a Vertex70, a fiber-coupled IRCube, and a Laser
Heterodyne spectro-Radiometer (LHR) developed by UK Rutherford Appleton Laboratory are the
participating instruments to achieve the Fiducial Reference Measurements (FRMs) status. Intensive
side-by-side measurements were performed using all four instruments next to the Bruker IFS 125HR
high spectral resolution FTIR, performing measurements in the NIR (TCCON configuration) and
MIR (NDACC configuration) spectral range.This research and APC were funded by the European Space Agency’s FRM Programme
under grant agreement no. 4000117640/16/I-LG and 4000136108/21/I-DT-lr. The PROFFAST data
processing scheme has been funded by the European Space Agency’s project COCCON-PROCEEDS
I-III under grant agreement no. 4000121212/17/I-EF and COCCON-OPERA under grant agreement
no. 4000140431/23/I-DT-Ir. The LHR development and deployment were further supported by the
UK Centre for Earth Observation Instrumentation (contract RP10G0435Z1)