Journal article
Satellite‐derived characteristics of Saharan cold pool outflows during boreal summer
- Abstract:
- Cold pool outflows (CPOs) are thought to be the most significant meteorological mechanism of mineral dust emission from the world's largest source in the central and western Sahara in boreal summer. An absence of CPOs from numerical models and reanalyses used to simulate Saharan dust emission leads to considerable error in modeling of dust fluxes from the Sahara. As such, the role of CPOs in the observed variability of dust through the monsoon season remains unclear. To remedy these issues, an improved observational benchmark is needed. In this research, an automated approach to identify and track CPOs in dust imagery from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) is derived. The approach is found to flag 74.2% of events identified manually (26/35). 1,559 events are tracked for June, July and August of 2004–2017. CPOs follow a clear diurnal cycle, peaking at 1700–1900 Universal Time Coordinated. Propagation speeds decay exponentially through their lifetime, but on average speeds are 1.5 ms−1 higher at night. About 22.5% of the observed events exceed a total traveled distance of 300 km, with an overwhelming preference for northwestwards propagation. Common across the southern central and western Sahara, CPO activity shifts north through summer in line with observed dust emission. The exception to this is the development of an intense hotspot of CPO activity in southern Algeria in August, which does not parallel any known late season outbreaks of dust. The results underline the importance of the southernmost Saharan dust sources, activated by frequent CPO occurrence in early summer.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 13.0MB, Terms of use)
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- Publisher copy:
- 10.1029/2020jd033387
Authors
- Publisher:
- Wiley
- Journal:
- Journal of Geophysical Research: Atmospheres More from this journal
- Volume:
- 126
- Issue:
- 3
- Article number:
- e2020JD033387
- Publication date:
- 2020-12-29
- Acceptance date:
- 2020-12-09
- DOI:
- EISSN:
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2169-8996
- ISSN:
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2169-897X
- Language:
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English
- Keywords:
- Pubs id:
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1151472
- Local pid:
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pubs:1151472
- Deposit date:
-
2021-01-01
Terms of use
- Copyright holder:
- Caton Harrison et al.
- Copyright date:
- 2021
- Rights statement:
- © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Licence:
- CC Attribution (CC BY)
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