Validation of SAGE III/ISS solar water vapor data with correlative satellite and balloon-borne measurements

Davis, Sean; Damadeo, Robert; Flittner, D. E.; Rosenlof, Karen H.; Park, M.; Randel, William J.; Hall, Emrys G.; Hùber, D. L.; Hurst, D. F.; Jordan, A. F.; Kizer, Susan; Millán, Luis; Selkirk, Henry B.; Taha, Ghassan; Walker, Kaley A.; Vömel, Holger

doi:10.1002/essoar.10504226.1

Cited by 2 publications

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“…Davis et al. (2021) include extensive SAGE III/ISS comparisons with MLS v4.2 retrievals, showing an overall dry bias for SAGE III/ISS of ∼10% in the stratosphere for June 2017–December 2019. Here we compare with the updated MLS v5.0 data, which is ∼5%–10% drier than v4.2 in the stratosphere.…”

Section: Resultsmentioning

confidence: 99%

“…Both the water vapor signal and the inversion process are affected by the presence of clouds, as discussed in Davis et al. (2021). For instance, uncertainties in water vapor grow rapidly where the aerosol extinction at 1,022 nm exceeds 1 × 10 −3 km −1 .…”

Section: Resultsmentioning

confidence: 99%

“…Davis et al. (2021) also makes recommendations on filtering the data for retrieval anomalies and cloud interference that are applied here. The data are provided in units of number density on altitude and are converted to mixing ratio using the temperature and pressure profiles reported in the SAGE III/ISS data files that originate from the Modern‐Era Retrospective analysis for Research and Applications, Version 2 (MERRA‐2, Gelaro et al., 2017).…”

Section: Data Descriptionmentioning

confidence: 99%

“…Note that this is a recent update from the MLS version 4.2 (v4.2) data used in Davis et al. (2021). Hurst et al.…”

Section: Data Descriptionmentioning

confidence: 99%

“…For direct comparisons between MLS and SAGE III/ISS in Section 3.1, MLS data are interpolated to the SAGE III/ISS measurement locations, altitudes and time, as described in Davis et al. (2021).…”

Section: Data Descriptionmentioning

confidence: 99%

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Near‐Global Variability of Stratospheric Water Vapor Observed by SAGE III/ISS

et al. 2021

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The Stratospheric Aerosol and Gas Experiment III instrument on the International Space Station (SAGE III/ISS) has been making high quality solar occultation measurements of stratospheric water vapor since June 2017. Here we evaluate the large‐scale geophysical variability of the SAGE III/ISS water vapor measurements for the first 3 years of observations (2017–2020) as part of data validation for retrieval version 5.1 (v5.1). Detailed comparisons of SAGE III/ISS v5.1 with the Aura Microwave Limb Sounder (MLS) version 5 retrievals show overall excellent agreement in terms of seasonal mean structure and large‐scale variability. SAGE III/ISS data capture the well‐known seasonal variations in water vapor including the vertically propagating “tape recorder” in the tropics and lower stratospheric maxima linked to the NH summer monsoons. The high vertical resolution (∼2 km) measurements from SAGE III/ISS demonstrate contributions of the monsoons to the wet phase of “tape recorder” during the Northern Hemisphere (NH) summer. Interannual variations over the short data record are also consistent between SAGE III/ISS and MLS in the stratosphere between 16 and 30 km. We furthermore evaluate large‐scale variations in relative humidity (RH) derived from the high vertical resolution SAGE III/ISS water vapor measurements, highlighting the detailed seasonal behavior and links to thermal structure near the tropical tropopause. Spatial distributions of RH at the cold point tropopause (CPT) show a close link between high RH and the minimum CPT temperature in both the NH winter and summer, consistent with temperature control of water vapor near the tropopause.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Data Descriptionmentioning

confidence: 99%

“…Note that this is a recent update from the MLS version 4.2 (v4.2) data used in Davis et al. (2021). Hurst et al.…”

Section: Data Descriptionmentioning

confidence: 99%

Section: Data Descriptionmentioning

confidence: 99%

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Near‐Global Variability of Stratospheric Water Vapor Observed by SAGE III/ISS

et al. 2021

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The SPARC Water Vapor Assessment II: assessment of satellite measurements of upper tropospheric humidity

et al. 2022

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Abstract. Nineteen limb-viewing data sets (occultation, passive thermal, and UV scattering) and two nadir upper tropospheric humidity (UTH) data sets are intercompared and also compared to frost-point hygrometer balloon sondes. The upper troposphere considered here covers the pressure range from 300–100 hPa. UTH is a challenging measurement, because concentrations vary between 2–1000 ppmv (parts per million by volume), with sharp changes in vertical gradients near the tropopause. Cloudiness in this region also makes the measurement challenging. The atmospheric temperature is also highly variable ranging from 180–250 K. The assessment of satellite-measured UTH is based on coincident comparisons with balloon frost-point hygrometer sondes, multi-month mapped comparisons, zonal mean time series comparisons, and coincident satellite-to-satellite comparisons. While the satellite fields show similar features in maps and time series, quantitatively they can differ by a factor of 2 in concentration, with strong dependencies on the amount of UTH. Additionally, time-lag response-corrected Vaisala RS92 radiosondes are compared to satellites and the frost-point hygrometer measurements. In summary, most satellite data sets reviewed here show on average ∼30 % agreement amongst themselves and frost-point data but with an additional ∼30 % variability about the mean bias. The Vaisala RS92 sonde, even with a time-lag correction, shows poor behavior for pressures less than 200 hPa.

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Validation of SAGE III/ISS solar water vapor data with correlative satellite and balloon-borne measurements

Cited by 2 publications

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Near‐Global Variability of Stratospheric Water Vapor Observed by SAGE III/ISS

Near‐Global Variability of Stratospheric Water Vapor Observed by SAGE III/ISS

The SPARC Water Vapor Assessment II: assessment of satellite measurements of upper tropospheric humidity

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