International Journal of Climatology
1097-0088
0899-8418
Anh Quốc
Cơ quản chủ quản: WILEY , John Wiley and Sons Ltd
Lĩnh vực:
Atmospheric Science
Phân tích ảnh hưởng
Thông tin về tạp chí
The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
Các bài báo tiêu biểu
High‐frequency daily temperature variability in China and its relationship to large‐scale circulation ABSTRACT Two measures of intra‐seasonal variability, indicated respectively by standard deviations (SD ) and day‐to‐day (DTD ) fluctuations denoted by absolute differences between adjacent 2‐day periods, as well as their relationships with large‐scale circulation patterns were investigated in China during 1962–2008 on the basis of homogenized daily temperature records from 549 local stations and reanalysis data. Our results show that both the SD and DTD of daily minimum temperatures (T min ) in summer as well as the minimum and maximum temperatures in winter have been decreasing, while the daily maximum temperature (T max ) variability in summer is fluctuating more, especially over southern China. In summer, an attribution analysis indicates that the intensity of the Western Pacific Subtropical High (WPSH ) and high‐level East Asian Subtropical Jet stream (EASJ ) are positively correlated with both SD and DTD , but the correlation coefficients are generally greater with the SD than with the DTD of the daily maximum temperature, T max . In contrast, the location of the EASJ shows the opposite correlation pattern, with intensity regarding the correlation with both SD and DTD . In winter, the Arctic Oscillation (AO ) is negatively correlated with both the SD and DTD of the daily minimum temperature, but its intra‐seasonal variability exhibits good agreement with the SD of the T min . The Siberian High acts differently with respect to the SD and DTD of the T min , demonstrating a regionally consistent positive correlation with the SD . Overall, the large‐scale circulation can well explain the intra‐seasonal SD, but DTD fluctuations may be more local and impacted by local conditions, such as changes in the temperature itself, the land surface, and so on.
Tập 37 Số 2 - Trang 570-582 - 2017
Interannual variations in seasonal march of rainfall in the Philippines Abstract This study investigated interannual variations in seasonal march of rainfall in the Philippines by revealing onset and withdrawal pentads of rainy seasons from 1961 to 2000. For defining the onset and withdrawal of rainy season, the empirical orthogonal function (EOF) analysis was applied. As a result, the onset of summer rainy season, when started in mid‐May on the average, was frequently delayed and fluctuated more greatly after the latter half of the 1970s. Such characteristics were not found in the onset of autumn rainy season, which corresponds to the increase in rainfall amount on the east coast. To clarify causes of the long‐term change in the onset timing of the summer rainy season, we classified transition patterns of atmospheric circulation related to the onset of the summer rainy season by applying the EOF analysis to spatial anomalies of geopotential height at 850 hPa level. The first two dominant EOF modes showed three important triggers of the onset of the summer rainy season in atmospheric circulation: (1) the northeastwards shift in the subtropical high over the western North Pacific, (2) the evolution of the monsoon trough over the northern South China Sea and (3) the great approach of the easterly wave. Additionally, interannual variations in the time coefficients of EOF1 have a positive tendency on the boundary of the latter half of the 1970s and are significantly correlated with those in the onset of the summer rainy season. That is, it was suggested that the change of the onset timing in the summer rainy season after the latter half of the 1970s was related to a long‐term change in transition patterns of atmospheric circulation connected with the onset of the summer rainy season. Copyright © 2009 Royal Meteorological Society
Tập 30 Số 9 - Trang 1301-1314 - 2010
Seasonal march and its spatial difference of rainfall in the Philippines Abstract On the basis of the pentad rainfall data averaged from 1961 to 2000, the seasonal march of rainfall in the Philippines is analyzed in this study. The relation to the atmospheric circulation at the 850 hPa level is also discussed. To investigate the temporal and spatial features of rainfall, the Empirical orthogonal function (EOF) analysis was applied to rainfall data. The result showed two dominant modes in the seasonal march of rainfall. The first mode reveals the increase of rainfall amount in the entire Philippines during summer monsoon while the second mode represents the contrast between the west and east coasts in the seasonal march of rainfall. The rainy season starts simultaneously over the entire west coast in the middle of May and withdraws gradually from northern stations around November. And on the east coast, the rainfall amount increases in autumn and winter rather than in summer. These regional differences between west and east coasts are considered to correspond to the seasonal change of Asian summer monsoon and orographic effect. The seasonal march of rainfall in the Philippines is characterized by the sudden change of atmospheric circulation around the Philippines. Particularly, the onset and peak of rainy season on the west coast are influenced by the eastward shift of the subtropical high and the evolution of the monsoon trough with southwesterly, respectively. The increase of rainfall on the east coast is related with the weakened monsoon trough around early September. Copyright © 2006 Royal Meteorological Society
Tập 27 Số 6 - Trang 715-725 - 2007
A 117‐year long index of the Pacific‐Japan pattern with application to interdecadal variability
Tập 36 Số 4 - Trang 1575-1589 - 2016
Trends in total precipitation and magnitude-frequency of extreme precipitation in Iran, 1969-2009
Tập 36 Số 4 - Trang 1863-1872 - 2016
Trends in indices for extremes in daily temperature and precipitation over Utah, USA Abstract The main objective of this study was to analyse the trends in 20 annual extreme indices of temperature and precipitation for Utah, USA. The analyses were conducted for 28 meteorological stations, during the period from 1930 to 2006, characterized by a long‐term and high‐quality dataset. The software used to process the data was the RClimdex 1.0. The analyses of extreme temperature indices have identified an increase in air temperature in Utah during the last century. Meanwhile, the analyses of precipitation indices showed a large variation throughout the studied area and time period, and, in general, with few statistically significant trends. Thus, it was not possible to conclude that significant changes in precipitation have occurred in this region over the last century. Copyright © 2010 Royal Meteorological Society
Tập 31 Số 12 - Trang 1813-1822 - 2011
Trends in extreme daily precipitation indices in India Abstract We assembled daily precipitation records, initially for 3838 stations, throughout India and ultimately identified 129 stations with reasonably complete records over the period 1910 to 2000. From these daily records, we generated annual time series of seven different indices of extreme precipitation events, including total precipitation, largest 1, 5, and 30 day totals, and the number of daily events above the amount that marks the 90th, 95th, and 97.5th percentiles of all precipitation at each station. Of the 903 different time series (seven variables for 129 stations), 114 had a significant upward trend and 61 had a significant downward trend; overall, 61% of the time series showed an upward trend. The standard regression coefficients showing the strength and sign of the trend were highly correlated across the network. They generally showed increasing values in a contiguous region extending from the northwestern Himalayas in Kashmir through most of the Deccan Plateau in the south and decreasing values in the eastern part of the Gangetic Plain and parts of Uttaranchal. Our results are in general agreement with the prediction from numerical models for an increase in extreme precipitation events in India given the ongoing build‐up of greenhouse gases. Copyright © 2004 Royal Meteorological Society
Tập 24 Số 4 - Trang 457-466 - 2004
ENSO-related rainfall anomalies in South America and associated circulation features during warm and cold Pacific decadal oscillation regimes
Tập 25 Số 15 - Trang 2017-2030 - 2005
A model intercomparison study of climate change‐signals in extratropical circulation Abstract Since 1970, the observed time series of various extratropical circulation modes have revealed remarkable trends. In many studies it has been suggested that these trends may be related to global warming due to increasing greenhouse gas (GHG) concentrations. Coupled climate model scenario experiments may give a hint of such a relationship. Here, a large model intercomparison study is presented, incorporating most state‐of‐the‐art models of the international modeller community with GHG and GHG plus sulphate aerosol (SUL) forcing, in order to quantify the signals common to different climate models and to determine the degree of uncertainty. The extratropical circulation candidates are the Arctic oscillation (AO), the North Atlantic oscillation (NAO), the Aleutian low (AL) and the Antarctic oscillation (AAO). Most climate models agree in predicting positive AO and AAO trends into the 21st century, these being different from the respective results of long‐term control experiments. The NAO appears to be less sensitive to radiative forcing, with slightly positive and negative trends occurring in different models. The AL tends to strengthen in several models with GHG + SUL forcing. Projecting the spatial structure of the circulation modes onto the trend patterns of mean sea‐level pressure (SLP) indicates that, in particular, the AO and AAO contribute considerably to the simulated long‐term trends in SLP. Intermodel variations in Northern Hemisphere SLP trends become predominantly apparent over the mountainous regions and the North Pacific. In the Southern Hemisphere, the Antarctic region is subject to large model uncertainties. The multi‐decadal trends of all circulation modes except the NAO are statistically significant in the majority of the climate‐change experiments. At the interannual time scale, external radiative forcing does account for a small but statistically significant part of total multi‐model variability, but this part is of the same order of magnitude as the systematic differences between the models. At decadal time scales, the external impact clearly stands out from the other sources of variability. Present‐day climate models mostly agree in predicting a strengthening of the annular modes AO and AAO. As all models generally project a deepening of SLP over the polar caps, time series indicative of these regions might be a more appropriate measure of the sensitivity of extratropical circulation. Copyright © 2004 Royal Meteorological Society
Tập 24 Số 5 - Trang 643-662 - 2004
Extreme seasonal droughts and floods in Amazonia: causes, trends and impacts ABSTRACT This paper reviews recent progress in the study and understanding of extreme seasonal events in the Amazon region, focusing on drought and floods. The review includes a history of droughts and floods in the past, in the present and some discussions on future extremes in the context of climate change and its impacts on the Amazon region. Several extreme hydrological events, some of them characterized as ‘once in a century’, have been reported in the Amazon region during the last decade. While abundant rainfall in various sectors of the basin has determined extreme floods along the river's main stem in 1953, 1989, 1999, 2009, 2012–2015, deficient rainfall in 1912, 1926, 1963, 1980, 1983, 1995, 1997, 1998, 2005 and 2010 has caused anomalously low river levels, and an increase in the risk and number of fires in the region, with consequences for humans. This is consistent with changes in the variability of the hydrometeorology of the basin and suggests that extreme hydrological events have been more frequent in the last two decades. Some of these intense/reduced rainfalls and subsequent floods/droughts were associated (but not exclusively) with La Niña/El Niño events. In addition, moisture transport anomalies from the tropical Atlantic into Amazonia, and from northern to southern Amazonia alter the water cycle in the region year‐to‐year. We also assess the impacts of such extremes on natural and human systems in the region, considering ecological, economic and societal impacts in urban and rural areas, particularly during the recent decades. In the context of the future climate change, studies show a large range of uncertainty, but suggest that drought might intensify through the 21st century.
Tập 36 Số 3 - Trang 1033-1050 - 2016