Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.400 IF 3.400
  • IF 5-year value: 3.841 IF 5-year
    3.841
  • CiteScore value: 3.71 CiteScore
    3.71
  • SNIP value: 1.472 SNIP 1.472
  • IPP value: 3.57 IPP 3.57
  • SJR value: 1.770 SJR 1.770
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 70 Scimago H
    index 70
  • h5-index value: 49 h5-index 49
Discussion papers
https://doi.org/10.5194/amt-2019-473
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-473
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 21 Jan 2020

Submitted as: research article | 21 Jan 2020

Review status
This preprint is currently under review for the journal AMT.

Mind-the-gap part I: Accurately locating warm marine boundary layer clouds and precipitation using spaceborne radars

Katia Lamer1,a, Pavlos Kollias2,3,4, Alessandro Battaglia5,6, and Simon Preval5 Katia Lamer et al.
  • 1City University of New York
  • 2Brookhaven National Laboratory
  • 3Stony Brook University
  • 4Cologne University
  • 5University of Leicester, Leicester, UK
  • 6UK National Centre for Earth Observation
  • acurrently at: Brookhaven National Laboratory

Abstract. Ground-based radar observations show that, in the eastern north Atlantic, 50 % of warm marine boundary layer (WMBL) hydrometeors occur below 1.2 km and have reflectivities < −17 dBZ, thus making their detection from space susceptible to the extent of surface clutter and radar sensitivity.

Surface clutter limits the CloudSat-Cloud Precipitation Radar (CPR)’s ability to observe true cloud base in ~ 52 % of the cloudy columns it detects and true virga base in ~ 80 %, meaning the CloudSat-CPR often provides an incomplete view of even the clouds it does detect. Using forward-simulations, we determine that a 250-m resolution radar would most accurately capture the boundaries of WMBL clouds and precipitation; That being said, because of sensitivity limitations, such a radar would suffer from cloud cover biases similar to those of the CloudSat-CPR.

Overpass observations and forward-simulations indicate that the CloudSat-CPR fails to detect 29–41 % of the cloudy columns detected by the ground-based sensors. Out of all configurations tested, the 7 dB more sensitive EarthCARE-CPR performs best (only missing 9.0 % of cloudy columns) indicating that improving radar sensitivity is more important than shortening surface clutter for observing cloud cover. However, because 50 % of WMBL systems are thinner than 400 m, they tend to be artificially stretched by long sensitive radar pulses; hence the EarthCARE-CPR overestimation of cloud top height and hydrometeor fraction.

Thus, it is recommended that the next generation of space-borne radars targeting WMBL science shall operate interlaced pulse modes including both a highly sensitive long-pulse and a less sensitive but clutter limiting short-pulse mode.

Katia Lamer et al.

Interactive discussion

Status: open (until 26 Mar 2020)
Status: open (until 26 Mar 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Katia Lamer et al.

Katia Lamer et al.

Viewed

Total article views: 147 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
114 32 1 147 1 2
  • HTML: 114
  • PDF: 32
  • XML: 1
  • Total: 147
  • BibTeX: 1
  • EndNote: 2
Views and downloads (calculated since 21 Jan 2020)
Cumulative views and downloads (calculated since 21 Jan 2020)

Viewed (geographical distribution)

Total article views: 128 (including HTML, PDF, and XML) Thereof 128 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 17 Feb 2020
Publications Copernicus
Download
Short summary
Low-level shallow liquid clouds, among other things, generally contribute to global cooling; As such, it is important that we understand their properties and how they may be impacted by climate change. Radars onboard satellites may provide a global view of these clouds. This study aims to assess the ability of two existing space-based radars, CloudSat and EarthCARE, in characterizing low-level shallow liquid clouds and proposed alternative radar configurations to overcome existing limitations.
Low-level shallow liquid clouds, among other things, generally contribute to global cooling; As...
Citation