Weather categorization — a useful tool for assessing climatic trends

Nemešová, Ivana; Klimperová, Nina

doi:10.1007/bf00865538

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Protraction of the season of discomfort may be related to systematic changes in the timing of seasonal atmospheric circulation changes and thus the timing of the climatological seasons (Cheng & Kalkstein 1997) over southern Europe. Although no studies have been specifically directed at determining this, there appears to have been changes in the frequency of European circulation types (Bardossy & Caspary 1990, Nemesova & Klimperova 1995, Huth 2001. For example, Bardossy & Caspary (1990) have shown an increasing southerliness of flow over Europe at the annual time scale, while for summer Huth (2001) has demonstrated an increasing frequency of anticyclones.…”

Section: Discussionmentioning

confidence: 99%

An evaluation of the nature and timing of summer human thermal discomfort in Athens, Greece

McGregor¹,

Markou²,

Bartzokas³

et al. 2002

Clim. Res.

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An assessment of the summer human thermal climate over the period 1966-1995 for Athens, Greece, was undertaken using the predicted mean vote (PMV). At the seasonal (diurnal) time scale human thermal discomfort reaches a maximum over a 20 d (4 to 6 h) period centred on the end of July (14:00 h LST). Not only are general levels of thermal discomfort variable at the intra-and inter-annual time scales, but the timing of discomfort season onset and cessation is highly variable from year to year. Mann-Kendall tests for trends of discomfort season diagnostics revealed that there has been a tendency towards an increase in the length of the discomfort season over the study period. The implications of Athens' harsh human thermal climate for staging athletic events are discussed, and the concept of cool and warm synthetic summers is introduced as a basis for the planning of human activities.

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Section: Discussionmentioning

confidence: 99%

An evaluation of the nature and timing of summer human thermal discomfort in Athens, Greece

McGregor¹,

Markou²,

Bartzokas³

et al. 2002

Clim. Res.

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“…It illustrates the local representation and shaping of each HB weather-type regarding temperature and precipitation for every month (e.g. Nemešová and Klimperová 1995). Furthermore, it allows to identify cold and warm as well as dry and wet weather-types.…”

Section: Weather-type Characteristicsmentioning

confidence: 99%

Identification of possible dynamical drivers for long-term changes in temperature and rainfall patterns over Europe

Hoffmann

Spekat

2020

Theor Appl Climatol

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This study looks into the question to what extent long-term change patterns of observed temperature and rainfall over Europe can be attributed to dynamical causes, in other words: Are the observed changes due to a change in frequency of the patterns or have the patterns’ dynamical properties changed? By using a combination of daily meteorological data and a European weather-type classification, the long-term monthly mean temperature and precipitation were calculated for each weather-type. Subsequently, the observed weather-type sequences were used to construct analogue time series for temperature and precipitation which only include the dynamical component of the long-term variability since 1961. The results show that only a fraction of about 20% of the past temperature rise since 1990, which for example amounted to 1 °C at the Potsdam Climate Station can be explained by dynamical changes, i.e. most of the weather-types have become warmer. Concerning long-term changes of seasonal rainfall patterns, a fraction of more than 60% is considerably higher. Moreover, the results indicate that for rainfall compared with temperature, the decadal variability and trends of the dynamical component follow the observed ones much stronger. Consequently, most of the explained seasonal rainfall variances can be linked to changes in weather-type sequences in Potsdam and over Europe. The dynamical contribution to long-term changes in annual and seasonal rainfall patterns dominates due to the fact that the alternation of wet and dry weather-types (e.g. the types Trough or High pressure over Central Europe), their frequencies and duration has significantly changed in the last decades.

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Disaggregating climatic trends by classification of circulation patterns

Huth

2001

Intl Journal of Climatology

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The trends in occurrence frequencies of circulation types over Europe and in nine climate variables in the Czech Republic conditioned by the types are examined for period . The circulation types are determined by an objective procedure from daily 500 hPa heights. Both in summer and winter, anticyclonic types have become more frequent at the expense of cyclonic types. The circulation changes are shown to be unrelated to the trends in surface climate elements in summer, whereas in winter, trends in circulation explain a part of the observed warming and strengthening of southerly winds.The trends in climate elements are not uniform among circulation types. In summer, the trend pattern consisting of decreasing maximum and daily mean temperatures, daily temperature range (DTR) and sunshine duration, and increasing cloudiness and relative humidity is observed under the cyclonic types and the types with a well-pronounced jet, but is missing under types with a blocking anticyclone over Europe. Two possible mechanisms causing this trend pattern are proposed: increasing cloudiness, and a process responsible for the reduction of sunshine without a concurrent increase of cloudiness. The latter mechanism can possibly be identified with increasing aerosol concentrations. In winter, the degree of warming is governed by changes in zonal wind. The mechanism of change in DTR seems to vary with elevation: at the lowland station (Prague-Klementinum), the increase in DTR is related to the warming trend, and consequently with zonal wind changes, while at the mountain station (Milešovka), the increase in DTR reflects the increase in precipitating clouds.The changes in DTR are related much more to mid-tropospheric circulation than to cloud cover in summer, whereas in winter, cloud cover plays a more important role in affecting DTR trends.

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Weather categorization — a useful tool for assessing climatic trends

Cited by 4 publications

References 16 publications

An evaluation of the nature and timing of summer human thermal discomfort in Athens, Greece

An evaluation of the nature and timing of summer human thermal discomfort in Athens, Greece

Identification of possible dynamical drivers for long-term changes in temperature and rainfall patterns over Europe

Disaggregating climatic trends by classification of circulation patterns

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