Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.102
IF3.102
IF 5-year value: 3.284
IF 5-year
3.284
CiteScore value: 5.1
CiteScore
5.1
SNIP value: 1.37
SNIP1.37
IPP value: 3.21
IPP3.21
SJR value: 1.005
SJR1.005
Scimago H <br class='widget-line-break'>index value: 90
Scimago H
index
90
h5-index value: 42
h5-index42
Preprints
https://doi.org/10.5194/nhess-2019-286
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-286
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Oct 2019

09 Oct 2019

Review status
This preprint was under review for the journal NHESS. A revision for further review has not been submitted.

Synoptic and Mesoscale atmospheric features associated with an extreme Snowstorm over the Central Andes in August 2013

Marcelo Zamuriano1, Paul Froidevaux1,2, Isabel Moreno3, Mathias Vuille4, and Stefan Brönnimann1 Marcelo Zamuriano et al.
  • 1Oeschger Centre for Climate Change Research and Institute of Geography, University of Bern, Switzerland
  • 2Meteotest AG, Bern, Switzerland
  • 3UMSA/LFA, La Paz, Bolivia
  • 4Dept. of Atmospheric and Environmental Sciences, Univ. at Albany, USA

Abstract. We study the synoptic and mesoscale characteristics of a snowfall event over the Bolivian Altiplano in August 2013 that caused severe damage to people, infrastructure and livestock. This event was associated with a cold front episode following the eastern slope of the Andes-Amazon interface and a cut-off low pressure system (COL) over the Pacific Ocean. Large scale analyses suggest a two-stage mechanism: The first phase consisted of a strong cold surge to the east of the Andes inducing low level blocking of southward moisture transport over the SW Amazon basin due to post-frontal high-pressure up to 500 hPa synchronized to a Rossby wave train. The second stage was initiated by the displacement of 500 hPa anticyclone over the Andes due to a Rossby wave passage and a subsequent increase in north-easterly moisture transport, while another cold front along the eastern Andes provided additional lifting. We analyse an analog event (July 2010) to confirm the influence of these large-scale features on snow formation.

We conduct a mesoscale analysis using the Weather Research and Forecasting (WRF-ARW) model. For this purpose, we perform a series of high-resolution numerical experiments that include sensitivity studies where we apply orographic and lake Titicaca temperature modifications. We compare our findings to MODIS snow cover estimates and in-situ measurements. The control simulation is able to capture the snow cover spatial distribution and sheds light over several aspects of the snowfall dynamics. In our WRF simulations, daytime snowfall mainly occurs around complex orography whereas nocturnal snowfall is concentrated over the plateau due to a combination of nocturnal winds and complex orography inside the plateau. The sensitivity experiments indicate the importance of the lake and mountain for thermal wind circulation affecting the spatial distribution of snowfall by shifting the position of the convergence zones. The influence of the lake's thermal effect is not evident around the regions surrounding the lake.

Marcelo Zamuriano et al.

Interactive discussion

Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Marcelo Zamuriano et al.

Marcelo Zamuriano et al.

Viewed

Total article views: 396 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
280 101 15 396 31 23 21
  • HTML: 280
  • PDF: 101
  • XML: 15
  • Total: 396
  • Supplement: 31
  • BibTeX: 23
  • EndNote: 21
Views and downloads (calculated since 09 Oct 2019)
Cumulative views and downloads (calculated since 09 Oct 2019)

Viewed (geographical distribution)

Total article views: 356 (including HTML, PDF, and XML) Thereof 348 with geography defined and 8 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 30 Oct 2020
Publications Copernicus
Download
Citation
Altmetrics