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Current state of the water vapour feedback

less than 1 minute read

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The CO2 - water vapour positive climate feedback is real and active. The figure below is showing the meridional-vertical cross-section of the zonally-averaged specific humidity increase based between 1980 and 2018 for ERA5 reanalyses of the European Centre for Medium-range Weather Forecasts (ECMWF). The yearly-average specific humidity at certain grid point was computed for every year between 1980 to 2018 to estimate the linear trend and the difference between the trendline values are plotted.

publications

talks

teaching

Meteorological Observations and Instrumentation

Undergraduate course, University of Ljubljana, Faculty of Mathematics and Physics, 2016

The handbook for the course written by dr. Matic Šavli (now Meteo-France), dr. Katarina Kosovelj and me.

Weakening or strengthening of the Hadley Cell?

Master thesis, University of Ljubljana, Faculty of Mathematics and Physics, 2019

Graduate student Matic Pikovnik will study the yearly and monthly trends in Hadley circulation in the ERA5 reanalyses. The climate models and the majority of reanalyses are showing very distinct trends: the former show weakening, while the latter predict strengthening. The most recent argument which favors climate models’ prediction versus that of reanalyses is that the reanalyses overestimate the tropical precipitation, based on the verification with GPCP data. Precipitation is the nearest proxy for condensation heating and vertical motions. Consequently, too strong precipitation would result in enhanced Hadley cell. However, latest ERA5 data verify much better with available precipitation datasets, but still show mild enhancement of the Hadley cell over the 1980-2018 period.

PhDs [SLO]

Postgraduate course, University of Ljubljana, Faculty of Mathematics and Physics, 2020

Mladi raziskovalec (redna zaposlitev)

PhDs [ENG]

Postgraduate course, University of Ljubljana, Faculty of Mathematics and Physics, 2020

Machine learning in meteorology