The global and multi-annual MUSICA IASI {H<sub>2</sub>O, <i>δ</i>D} pair dataset
<p>We present a global and multi-annual space-borne dataset of tropospheric {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</sp...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/af346c88a63f419e9bc27f2673a2c523 |
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| Sumario: | <p>We present a global and multi-annual space-borne dataset of tropospheric {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pairs that is based on radiance
measurements from the nadir thermal infrared sensor IASI (Infrared Atmospheric Sounding Interferometer) on board the Metop satellites of EUMETSAT
(European Organisation for the Exploitation of Meteorological Satellites). This dataset is an a posteriori processed extension of the MUSICA
(MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water) IASI full product dataset as presented in
<span class="cit" id="xref_text.1"><a href="#bib1.bibx38">Schneider et al.</a> (<a href="#bib1.bibx38">2021</a><a href="#bib1.bibx38">b</a>)</span>. From the independently retrieved <span class="inline-formula">H<sub>2</sub>O</span> and <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span> proxy states, their a priori settings and constraints,
and their error covariances provided by the IASI full product dataset, we generate an optimal estimation product for pairs of <span class="inline-formula">H<sub>2</sub>O</span> and
<span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>. Here, this standard MUSICA method for deriving {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pairs is extended using an a posteriori
reduction of the constraints for improving the retrieval sensitivity at dry conditions.</p>
<p>By applying this improved water isotopologue post-processing for all cloud-free MUSICA IASI retrievals, this yields a {<span class="inline-formula">H<sub>2</sub>O</span>,
<span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pair dataset for the whole period from October 2014 to December 2020 with global coverage twice per day (local morning and
evening overpass times). In total, the dataset covers more than 1500 million individually processed observations. The retrievals are most sensitive
to variations in {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pairs within the free troposphere, with up to 30 % of all retrievals containing vertical
profile information in the {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pair product. After applying appropriate quality filters, the largest number of
reliable pair data arises for tropical and subtropical summer regions, but higher latitudes also show a considerable amount of reliable
data. Exemplary time series over the tropical Atlantic and West Africa are chosen to illustrate the potential of the MUSICA IASI {<span class="inline-formula">H<sub>2</sub>O</span>,
<span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pair data for atmospheric moisture pathway studies. Furthermore, in order to facilitate the application of this rather
comprehensive MUSICA IASI {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pair dataset (referred to as Level-2), we additionally provide the data in a
re-gridded and simplified format (Level-3) with focus on the quality-filtered {<span class="inline-formula">H<sub>2</sub>O</span>, <span class="inline-formula"><i>δ</i></span><span class="inline-formula">D</span>} pairs in the free troposphere. A
technical documentation for guiding the use of both datasets is attached as the Supplement. Finally, the Level-2 dataset is referenced with the DOI
<a href="https://doi.org/10.35097/415">https://doi.org/10.35097/415</a> <span class="cit" id="xref_paren.2">(<a href="#bib1.bibx10">Diekmann et al.</a>, <a href="#bib1.bibx10">2021</a><a href="#bib1.bibx10">a</a>)</span> and the Level-3 dataset with DOI <a href="https://doi.org/10.35097/495">https://doi.org/10.35097/495</a> <span class="cit" id="xref_paren.3">(<a href="#bib1.bibx11">Diekmann et al.</a>, <a href="#bib1.bibx11">2021</a><a href="#bib1.bibx11">b</a>)</span>.</p> |
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