Warming and wetting signals emerging from analysis of changes in climate extreme indices over South América
Javier Sigró
Coordinator of the Master Program
and the Centre for Climate Change (C3), Department of Geography, University
Rovira i Virgili
27/03 (quinta-feira) das
15:00 às 17:00 hs
Anfiteatro A do CCET
Resumo
Here we show and discuss
the results of an assessment of changes in both area-averaged and station-based
climate extreme indices over South America (SA) for the [WINDOWS-1252?]1950–2010
and [WINDOWS-1252?]1969–2009 periods using high-quality daily maximum and
minimum temperature and precipitation series. A weeklong regional workshop in
Guayaquil (Ecuador) provided the opportunity to extend the current picture of changes
in climate extreme indices over SA. Our results provide evidence of warming and
wetting across the whole SA since the mid-20th century onwards. Nighttime
(minimum) temperature indices show the largest rates of warming (e.g. for
tropical nights, cold and warm nights), while daytime (maximum) temperature
indices also point to warming (e.g. for cold days, summer days, the annual
lowest daytime temperature), but at lower rates than for minimums. Both tails
of night-time temperatures have warmed by a similar magnitude, with cold days
(the annual lowest nighttime and daytime temperatures) seeing reductions
(increases). Trends are strong and moderate (moderate to weak) for
regional-averaged (local) indices, most of them pointing to a less cold SA
during the day and warmer night-time temperatures.
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