The CM SAF ATOVS data record: overview of methodology and evaluation of total column water and profiles of tropospheric humidity

Courcoux, N.; Schröder, Marc

doi:10.5194/essd-7-397-2015

Cited by 8 publications

(7 citation statements)

References 48 publications

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“…These results are comparable to those of Courcoux and Schröder (2015), who obtained wet and dry biases of -0.7 and 0.6 kg m -2 respectively, at the lower and middle layers of the troposphere, while comparing humidity products from ATOVS with those of the Global Climate Observing System (GCOS) Upper-Air Network (GUAN) radiosondes. Figure 6 presents the scatter-plots and least square regression lines of the difference in PWV (W D = W S -W R ) against W S at the different layers and for the three stations that had radiosonde data.…”

Section: Comparison Between Satellite and Radiosonde Datasupporting

confidence: 75%

Characteristics of precipitable water over Peninsular Malaysia from satellite and in situ data

Makama¹,

San²

2017

Terr. Atmos. Ocean. Sci.

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Variations as well as distribution patterns of total precipitable water vapour (WST) and layered precipitable water vapour (W) over Peninsular Malaysia using data retrieved and archived by the Satellite Application Facilities on Climate Monitoring (CM SAF), Deutscher Wetterdienst, Germany, for the period 2001 -2011 are analysed using simple regression method. The lower and middle layers of W are observed to exhibit bimodal annual oscillations, which are in phase with WST at all the climatic regions, with a pair of minima and maxima in each case. The primary and secondary minima occur in February and August, while their maxima counterparts are noticed around November and May/June respectively. These oscillations are synchronous to the movement of the prevailing monsoons. The satellite and radiosonde products are compared at the seasonal scale and the results show good agreement, with correlation coefficients between 0.60 -0.98 and mean bias range of -0.60 -0.59 kg m -2 throughout the study area. Also at the seasonal scale WST and W exhibit significant agreement at all the stations for which radiosonde records were available. The difference between W, from the two sources of measurements are relatively uniform, irrespective of the satellite value, at all the layers and to a large extend, throughout the period of the year. While the satellite precipitable water is greater than its radiosonde counterpart at the middle and upper layers, the reverse is, however, the case for the lower layer in all the climatic regions. These differences are more as a result of instrumentation than the variability of the atmosphere.

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Section: Comparison Between Satellite and Radiosonde Datasupporting

confidence: 75%

Characteristics of precipitable water over Peninsular Malaysia from satellite and in situ data

Makama¹,

San²

2017

Terr. Atmos. Ocean. Sci.

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“…After application of a kriging routine, the products are available as daily and monthly means on a cylindrical equal area projection at a resolution of 90 km × 90 km. Further details on the retrieval, the data record and validation results can be found in Courcoux and Schröder (2015). Also, the validation report, algorithm theoretical basis document and product user manual can be downloaded from http://www.cmsaf.eu/docs (last access: 12 June 2018).…”

Section: Atovs CM Safmentioning

confidence: 99%

The GEWEX Water Vapor Assessment archive of water vapour products from satellite observations and reanalyses

Schröder

Lockhoff

Fell

et al. 2018

Earth Syst. Sci. Data

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Abstract. The Global Energy and Water cycle Exchanges (GEWEX) Data and Assessments Panel (GDAP) initiated the GEWEX Water Vapor Assessment (G-VAP), which has the main objectives to quantify the current state of the art in water vapour products being constructed for climate applications and to support the selection process of suitable water vapour products by GDAP for its production of globally consistent water and energy cycle products. During the construction of the G-VAP data archive, freely available and mature satellite and reanalysis data records with a minimum temporal coverage of 10 years were considered. The archive contains total column water vapour (TCWV) as well as specific humidity and temperature at four pressure levels (1000, 700, 500, 300 hPa) from 22 different data records. All data records were remapped to a regular longitudelatitude grid of 2 period 1988-2009. The G-VAP data archive is referenced under the following digital object identifier (doi): https://doi.org/10.5676/EUM_SAF_CM/GVAP/V001. Within G-VAP, the characterization of water vapour products is, among other ways, achieved through intercomparisons of the considered data records, as a whole and grouped into three classes of predominant retrieval condition: clear-sky, cloudy-sky and all-sky. Associated results are shown using the 22 TCWV data records. The standard deviations among the 22 TCWV data records have been analysed and exhibit distinct maxima over central Africa and the tropical warm pool (in absolute terms) as well as over the poles and mountain regions (in relative terms). The variability in TCWV within each class can be large and prohibits conclusions about systematic differences in TCWV between the classes.

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“…In 1998 the NOAA-15 satellite was launched with the Advanced Television and Infrared Observation Satellite Operational Vertical Sounder (ATOVS), consisting of the Advanced Microwave Sounding Units (AMSU-A and AMSU-B) and HIRS/3 (Li et al, 2000) provided significant improvements over TOVS, especially for Numerical Weather Prediction (NWP) (English et al, 2000). This technological change also allowed for course profiles of tropospheric humidity and temperature to be inferred operationally (Courcoux and Schröder, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tropospheric water vapour and temperature profiles retrieved from Metop-A by the Infrared and Microwave Sounding scheme

Trent

Siddens²,

Kerridge³

et al. 2022

Preprint

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Abstract. Since 2007, the Meteorological Operational satellite (Metop) series of platforms operated by the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) have provided valuable observations of the Earth's surface and atmosphere for meteorological and climate applications. With 15 years of data already collected, the next generation of Metop satellites will see this measurement record extend to and beyond 2045. With a primary role in operational meteorology, tropospheric temperature and water vapour profiles will be key data products produced using infrared and microwave-sounding instruments onboard. Considering the Metop data record that will span 40 years, these profiles will form an essential climate data record (CDR) for studying long-term atmospheric changes. Therefore, the performance of these products must be characterised to support the robustness of any current or future analysis. In this study, we validate 9.5 years of profile data produced using the Infrared and Microwave Sounding (IMS) scheme with the European Space Agency (ESA) Water Vapour Climate Change Initiative (WV_cci) against radiosondes from two different archives. The Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN) and Analysed RadioSoundings Archive (ARSA) data records were chosen for the validation exercise to provide the contrast between global observations (ARSA) with sparser characterised climate measurements (GRUAN). Results from this study show that IMS temperature and water vapour profile biases are within 1 K and 10 % of the reference for 'global' scales. We further demonstrate the difference day/night and cloud amount match-ups have on observed biases and discuss the implications sampling also plays on attributing these effects. Finally, we present a first look at the profile bias stability of the IMS product, relating trends in the bias to required climate performance. Overall, we find the results from this study demonstrate the real potential for tropospheric water vapour and temperature profile CDRs from the Metop series of platforms.

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The CM SAF ATOVS data record: overview of methodology and evaluation of total column water and profiles of tropospheric humidity

Cited by 8 publications

References 48 publications

Characteristics of precipitable water over Peninsular Malaysia from satellite and in situ data

Characteristics of precipitable water over Peninsular Malaysia from satellite and in situ data

The GEWEX Water Vapor Assessment archive of water vapour products from satellite observations and reanalyses

Evaluation of tropospheric water vapour and temperature profiles retrieved from Metop-A by the Infrared and Microwave Sounding scheme

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