Recent trend analysis of mean air temperature in Greece based on homogenized data

Mamara, Anna; Argiriou, Athanassios A.; Anadranistakis, M.

doi:10.1007/s00704-015-1592-x

Cited by 36 publications

(53 citation statements)

References 59 publications

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“…The summer significantly leads these trends for both indices (and also the autumn). This summer phenomenon is consistent with other EM and Israel studies (Price et al, 1999;Saaroni et al, 2003;Domroes and El-Tantawi, 2005;Kostopoulou and Jones, 2005;Ziv et al, 2005;Shohami et al, 2011;Tanarhte et al, 2012;Mamara et al, 2016;Yosef et al, 2018). A continuous steady rise in temperatures at the 850 hPa for the summer over the Mediterranean and the EM (Saaroni et al, 2003;Ziv et al, 2005;Shohami et al, 2011) together with a rapid increase in the occurrence of the weak Persian Trough (Saaroni et al, 2010) may be related to this significant increase.…”

Section: Discussionsupporting

confidence: 90%

Changes in extreme temperature and precipitation indices: Using an innovative daily homogenized database in Israel

Yosef

Aguilar

Alpert

2019

Intl Journal of Climatology

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This study examines the 1950–2017 temporal changes in climate extremes in Israel, which is located in the East Mediterranean (EM), a region which suffers from a scarcity of long and reliable datasets. It is well known that most long‐term records are affected by artificial shifts most commonly caused by station relocation, instrumental modification and local environmental changes. Therefore, for the first time, a thorough homogenization (detection and correction) routine was developed and implemented in the long‐term records. Consequently, a new daily adjusted dataset has been generated, including 34 temperature stations and 60 precipitation stations. Based on this comprehensive dataset, 38 extreme indices recommended by the Expert Team on Climate Change Detection and the Expert Team on Sector‐specific Climate Indices have been calculated. These indices will help various sectors to plan properly mitigation actions and adaptation for climate change, in addition to facilitating future studies for the EM. The results showed highly significant changes in temperature extremes associated with warming, especially for those indices derived from the daily minimum temperature (TN, 1950–2017), whereas the maximum temperature (TX) exhibited a similar increasing magnitude of the TN (~0.55°C/decade) in the last 30 years. The warming trends, which are non‐monotonic, seem to have been particularly strong since the early 1990s. The coastal area is characterized by higher heat stress during the nighttime, while mountains exhibit a strong tendency towards increasing temperatures during the noon hours. A reduction in the total precipitation amount and in the number of wet days with a tendency towards more intense wet days was found. Although all the regional trends of the precipitation indices were not statistically significant (p ≤ .05), they showed a fine spatial coherence.

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Section: Discussionsupporting

confidence: 90%

Changes in extreme temperature and precipitation indices: Using an innovative daily homogenized database in Israel

Yosef

Aguilar

Alpert

2019

Intl Journal of Climatology

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“…The trends of the homogenized

\overset{TX}{true}

and

\overset{TN}{true}

summer time series are 0.15 °C/decade ( p = .095 ) and 0.23 °C/decade ( p < .001 ), respectively. This general summer characteristic is in agreement with other studies for the Eastern Mediterranean and Israel (Price et al, ; Saaroni et al, ; Domroes and El‐Tantawi, ; Ziv et al, ; Shohami et al, ; Tanarhte et al, ; Mamara et al, ). This can be attributed, at least in part, to the rapid increase in the occurrence of the weak Persian Trough (which is a warm type) “on the account” of the strong one, over Israel (1948–2008), as was reported by Saaroni et al .…”

Section: Resultsmentioning

confidence: 99%

Detecting and adjusting artificial biases of long‐term temperature records in Israel

Yosef

Aguilar

Alpert

2018

Intl Journal of Climatology

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Climate trends analyses are studied through the analysis of long‐term records which usually are compromised by artificial non‐climatic factors (e.g., station relocation, instrumental replacements, etc). The impact of these factors on the analysis must be assessed and corrected in a procedure called “Homogenization,” before computing any trends. An unbiased analysis is essential for the East Mediterranean climate change, which suffers from scarcity of long and reliable datasets. Here, for the first time, we address these problems by jointly applying some of the state‐of‐the‐art homogenization methods, to long‐term Israeli temperature records (TX and TN) at five different meteorological stations throughout the period of 1950–2011. All of the studied time series were found to be inhomogeneous, where instrumentational issues were responsible for almost 50% of the breaks. The most frequent adjustments range between [−0.6, +0.6] oC while some larger adjustments do not fall within the range of the [−1, +1] °C interval. The adjustment of these breaks is crucial because they introduce large errors that may lead to wrong conclusions about the estimated trends. The difference in the seasonal and annual trends between raw and homogenized series was analysed applying the Mann–Kendall test. The general annual trend differences before and after homogenization, fell within the range of [−0.12, 0.16] oC/decade. Based on the homogenized dataset, a highly significant positive trend was found for the annual trueTN¯ with 0.15 °C/decade (p = .002) whereas the trueTX¯ trend was 0.10 °C/decade (p = .051). In general, the maximum temperature trends are lower and less statistically significant than those for minimum temperature. The most pronounced seasonal trends were recorded for the summer, which was characterized by significant positive trends for trueTX¯ (0.15 °C/decade) and trueTN¯ (0.23 °C/decade), while the winter had mainly no significant positive trends.

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“…Buffoni et al ., ; De Luís et al ., ; Yue and Hashino, ; Gemmer et al ., ; Marengo, ; Feidas et al ., ; Pujol et al ., ; Kampata et al ., ; de la Casa and Nasello, ; Karpouzos et al ., ; Longobardi and Villani, ; Oguntunde et al ., ; Tabari and Talaee, ; Villarini, ; Duhan and Pandey, ; Haktanir et al ., ; Mahsa et al ., ) while some studied only the temperature trends (e.g. Easterling et al ., ; Smadi, ; Tabari and Talaee, ; Saboohi et al ., ; Robaa and AL‐Barazanji, ; Mamara et al ., ; Kisi et al ., ). Some studies, however, have investigated the trends in both precipitation and temperature (e.g.…”

Section: Introductionmentioning

confidence: 95%

Long‐term spatiotemporal trend analysis of precipitation and temperature over Turkey

Hadi

Tombul

2018

Meteorological Applications

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Monthly precipitation and temperature data for Turkey were obtained from the Climate Research Unit Time Series (CRU TS V3.23) dataset and analysed. The records of 81 grids, each located in a province, were converted into annual and seasonal data. The Mann−Kendall test was used to determine trend significance. The Theil−Sen slope estimator was used for estimating the magnitude of the trend. The Pettitt−Mann−Whitney test was used on the annual data series to identify the 'most probable change year' for precipitation and temperature. The spatial pattern of the trend was analysed using a geographical information system environment. The results showed that the annual areal precipitation over the whole of Turkey is not significantly increasing with a magnitude of 0.11 mm year −1 , but the annual areal temperature is increasing significantly with a magnitude of 0.88 ∘ C century −1 . The grid analysis indicated that annual precipitation is decreasing in the southeastern Anatolia and Mediterranean regions and increasing in the Marmara and Black Sea regions, whilst other regions have no specific pattern. Although a trend is present in most of the grids, insignificance is dominant. Annual precipitation has no dominant change year with 1969 being the most probable. Seasonal precipitation has increasing and decreasing trends in the same regions that also show such trends in annual precipitation. Annual temperature has a significant, increasing trend in all regions. 1993 was found as the most probable change year. Seasonal temperature showed an increasing trend in all regions. The highest increasing trend for temperature was found in the summer.

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Recent trend analysis of mean air temperature in Greece based on homogenized data

Cited by 36 publications

References 59 publications

Changes in extreme temperature and precipitation indices: Using an innovative daily homogenized database in Israel

Changes in extreme temperature and precipitation indices: Using an innovative daily homogenized database in Israel

Detecting and adjusting artificial biases of long‐term temperature records in Israel

Long‐term spatiotemporal trend analysis of precipitation and temperature over Turkey

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