Nicholas Luke Tyrrell

Nicholas Luke Tyrrell
Finnish Meteorological Institute · Meteorology Unit

Doctor of Philosophy

About

14
Publications
1,156
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241
Citations
Introduction
I am postdoc researcher at the Finnish Meteorological Institute. I'm investigating the role of climatological bias on teleconnections, with a focus on the NH stratospheric polar vortex. For my PhD I studied the land-ocean temperature contrast in natural variability, focusing on interannual timescales and the role of the ocean in driving land temperature variability.
Additional affiliations
July 2015 - November 2015
Monash University (Australia)
Position
  • Tutor
Description
  • ATS2779 Climate Change and Variability
July 2014 - November 2014
Monash University (Australia)
Position
  • Tutor
Description
  • ATM2020 - Climate Dynamics of the Atmosphere and Ocean
February 2012 - December 2015
Monash University (Australia)
Position
  • PhD Student
Education
February 2007 - November 2011
Monash University (Australia)
Field of study
  • Science

Publications

Publications (14)
Article
Full-text available
The number of sudden stratospheric warmings (SSWs) per year is affected by the phase of the El Niño–Southern Oscillation (ENSO), yet there are discrepancies between the observed and modelled relationship. We investigate how systematic model biases in atmospheric winds and temperatures may affect the ENSO–SSW connection. A two-step bias correction p...
Preprint
Full-text available
The number of sudden stratospheric warmings (SSWs) per year is affected by the phase of the El Niño–Southern Oscillation (ENSO), yet there are discrepancies between the observed and modeled relationship. We investigate how systematic model biases may affect the ENSO-SSW connection. A two-step bias-correction process is applied to the troposphere, s...
Article
Full-text available
Correctly capturing the teleconnection between the El Niño–Southern Oscillation (ENSO) and Europe is of importance for seasonal prediction. Here we investigate how systematic model biases may affect this teleconnection. A two-step bias correction process is applied to an atmospheric general circulation model to reduce errors in the climatology. The...
Article
Full-text available
The Quasi‐biennial oscillation (QBO) in the equatorial stratospheric winds is known to modulate the extratropical atmospheric circulation so that an easterly QBO phase is associated with a weaker Arctic stratospheric vortex and a negative North Atlantic Oscillation in winter. The link can potentially be used to improve seasonal forecasts and is usu...
Article
Full-text available
We investigate the effect of systematic model biases on teleconnections influencing the Northern Hemisphere wintertime circulation. We perform a two-step nudging and bias-correcting scheme for the dynamic variables of the ECHAM6 atmospheric model to reduce errors in the model climatology relative to ERA-Interim. One result is a significant increase...
Preprint
Full-text available
Correctly capturing the teleconnection between the El Niño–Southern Oscillation (ENSO) and Europe is of importance for seasonal prediction. Here we investigate how systematic model biases may affect this teleconnection. A two–step bias–correction process is applied to an atmospheric general circulation model to reduce errors in the climatology. The...
Article
Full-text available
We investigate factors influencing European winter (DJFM) air temperatures for the period 1979‐2015 with the focus on changes during the recent period of rapid Arctic warming (1998‐2015). We employ meteorological reanalyses analysed with a combination of correlation analysis, two pattern clustering techniques, and back‐trajectory airmass identifica...
Article
Full-text available
Plain Language Summary The warm Arctic‐cold continent pattern is an observed, large‐scale pattern of near‐surface temperatures where the Arctic is warmer than average and Siberia is colder than average. This pattern was of record strength in October 2016, providing the opportunity to test its influence on the Northern Hemisphere atmospheric circula...
Article
Full-text available
Sudden stratospheric warmings (SSWs) are significant source of enhanced subseasonal predictability, but whether this source is untapped in operational models remains an open question. Here we report on the prediction of the SSW on 12 February 2018, its dynamical precursors, and surface climate impacts by an ensemble of dynamical forecast models. Th...
Article
Full-text available
The European Centre/Hamburg version 6 (ECHAM6) atmospheric model with a well-defined stratosphere and an internally-generated Quasi-biennial oscillation (QBO) was used to study the relationship between the Autumn Eurasian snow extent and the wintertime climate of the Northern Hemisphere. A positive snow cover anomaly was imposed over Eurasia in ear...
Conference Paper
Full-text available
In global warming scenarios, global land surface temperatures (T land) warm with greater amplitude than sea surface temperatures (SSTs), leading to a land/sea warming contrast even in equilibrium. Similarly, the interannual variability of T land is larger than the covariant interannual SST variability, leading to a land/sea contrast in natural vari...
Article
The El Niño Southern Oscillation (ENSO) has significant variations and non-linearities in its pattern and strength. ENSO events vary in their position along the equator, with some located in the central Pacific (CP) and others in the east Pacific (EP). To study how these variations are reflected in global ENSO teleconnections we analyze observation...
Article
In global warming scenarios, global land surface temperatures ( \(T_{land}\) ) warm with greater amplitude than sea surface temperatures (SSTs), leading to a land/sea warming contrast even in equilibrium. Similarly, the interannual variability of \(T_{land}\) is larger than the covariant interannual SST variability, leading to a land/sea contrast i...
Conference Paper
In global warming scenarios continental surface temperatures warm with greater amplitude than sea surface temperatures, leading to a land-sea temperature contrast. The land-sea contrast is also seen in warming and cooling on interannual timescales due to natural variability. The temperature contrast is due in part to the larger heat capacity of oce...

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Projects

Project (1)
Project
The overall goal of AFEC is to better understand direct and indirect effects of the Arctic on European weather and climate, and how these effects have changed due to the Arctic Amplification of climate warming.