A high-quality monthly pan evaporation dataset for Australia

Jovanovic, Branislava; Jones, David A.; Collins, Daniel J.

doi:10.1007/s10584-007-9324-6

Cited by 50 publications

(55 citation statements)

References 27 publications

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“…Appropriate inhomogeneity adjustments were applied using established methods to produce the first homogeneous pan evaporation dataset for Australia. Analysis of these data reveals that Australian annual mean pan-evaporation shows large interannual variability with no trend over the 1970-2005 period (Jovanovic et al 2008). Previous studies using unadjusted data had shown a decline in pan evaporation (e.g.…”

Section: No Universal Pan Evaporation Trendmentioning

confidence: 87%

“…A highquality monthly pan evaporation dataset of 60 stations has been developed for monitoring long-term pan evaporation trends over Australia (Jovanovic et al 2008). The quality control process involved examination of historical station metadata together with an objective test comparing candidate series with neighbouring stations.…”

Section: No Universal Pan Evaporation Trendmentioning

confidence: 99%

“…Previous studies using unadjusted data had shown a decline in pan evaporation (e.g. Roderick and Farquhar 2004;Rayner 2007), highlighting the importance of checking data for homogeneity before drawing conclusions about long-term trends (Jovanovic et al 2008). …”

Section: No Universal Pan Evaporation Trendmentioning

confidence: 99%

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A critical overview of pan evaporation trends over the last 50 years

Charles

2009

Climatic Change

122

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Despite the observed increases in global average temperature, observations across the world show that the rate of pan evaporation at a regional scale has been steadily decreasing over the past 50 years. This is known as the pan evaporation paradox. This paper reviews current reported pan evaporation trends, examines available theoretical explanations about this "paradox", and discusses current research gaps and priorities. It concludes that: (1) three major potential causes of pan evaporation, solar radiation, vapour pressure deficit (VPD) and wind speed, have been changing in the last 50 years. The magnitude of changes and importance of each of these three causes varies from region to region, as does the pan evaporation trend, although overall there is a decreasing trend. (2) Currently two existing theories explaining the pan evaporation trends have limits and are only valid in some specific regions and seasons. Neither of them provides a fundamental physical-based theory that could be applied everywhere. (3) Further investigations are needed before we can fully understand the global evapotranspiration trend in global warming scenarios.

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Section: No Universal Pan Evaporation Trendmentioning

confidence: 87%

Section: No Universal Pan Evaporation Trendmentioning

confidence: 99%

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A critical overview of pan evaporation trends over the last 50 years

Charles

2009

Climatic Change

122

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“…This relationship is strongest during spring and summer. Jovanovic et al (2008) found a near-zero trend in all-Australian pan evaporation over 1970-2005, despite a clear signal of atmospheric warming over this time. It has been suggested that decreases in solar radiation, or a decline in mean wind speed, may have offset the influence of a warmer atmosphere and reduced relative humidity.…”

Section: Comparison With Pan Evaporationmentioning

confidence: 82%

“…However, the potential for large discontinuities exists due to the subjective nature of the recordings. Several Australian high-quality (homogenised) climate datasets have been developed to identify, monitor and attribute changes in elements such as rainfall (Lavery et al 1992), temperature (Torok and Nicholls 1996;Della-Marta et al 2004) and pan evaporation (Jovanovic et al 2008). These datasets have been produced using a variety of quality control and correction techniques.…”

Section: Identification Of Data Inhomogeneitiesmentioning

confidence: 99%

A high-quality monthly total cloud amount dataset for Australia

et al. 2010

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A high-quality monthly total cloud amount dataset for 165 stations has been developed for monitoring and assessing long-term trends in cloud cover over Australia. The dataset is based on visual 9 a.m. and 3 p.m. observations of total cloud amount, with most records starting around 1957. The quality control process involved examination of historical station metadata, together with an objective statistical test comparing candidate and reference cloud series. Individual cloud series were also compared against rainfall and diurnal temperature range series from the same site, and individual cloud series from neighboring sites. Adjustments for inhomogeneities caused by relocations and changes in observers were applied, as well as adjustments for biases caused by the shift to daylight saving time in the summer months. Analysis of these data reveals that the Australian mean annual total cloud amount is characterised by high year-to-year variability and shows a weak, statistically non-significant increase over the 1957-2007 period. A more pronounced, but also non-significant, decrease from 1977 to 2007 is evident. A strong positive correlation is found between all-Australian averages of cloud amount and rainfall, while a strong negative correlation is found between mean cloud amount and diurnal temperature range. Patterns of annual and seasonal trends in cloud amount are in general agreement with rainfall changes across Australia, however the high-quality cloud network is too coarse to fully capture topographic influences. Nevertheless, the broadscale consistency between patterns of cloud and rainfall variations indicates that the new total cloud amount dataset is able to adequately describe the broadscale patterns of change over Australia. Favourable simple comparisons between surface and satellite measures of cloudiness suggest that satellites may ultimately provide the means for monitoring long-term changes in cloud over Australia. However, due to the relative shortness and homogeneity problems of the satellite record, a robust network of surface cloud observations will be required for many years to come.

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A review of recent climate variability and climate change in southeastern Australia

Murphy

Timbal

2007

Intl Journal of Climatology

537

494

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Southeastern Australia (SEA) has suffered from 10 years of low rainfall from 1997 to 2006. A protracted dry spell of this severity has been recorded once before during the 20th century, but current drought conditions are exacerbated by increasing temperatures. Impacts of this dry decade are wide-ranging, so a major research effort is being directed to better understand the region's recent climate, its variability and climate change. This review summarizes the conditions of these 10 years and the main mechanisms that affect the climate.Most of the rainfall decline (61%) has occurred in autumn (March-May). Daily maximum temperatures are rising, as are minimum temperatures, except for cooler nights in autumn in the southwest of SEA closely related to lower rainfall. A similar rainfall decline occurred in the southwest of western Australia around 1970 that has many common features with the SEA decline. SEA rainfall is produced by mid-latitude storms and fronts, interactions with the tropics through continental-scale cloudbands and cut-off lows.El Niño-Southern Oscillation impacts on SEA rainfall, as does the Indian Ocean, but neither has a direct influence in autumn. Trends have been found in both hemispheric (the southern annular mode) and local (sub-tropical ridge) circulation features that may have played a role in reducing the number and impact of mid-latitude systems around SEA, and thus reducing rainfall. The role of many of these mechanisms needs to be clarified, but there is likely to be an influence of enhanced greenhouse gas concentrations on SEA climate, at least on temperature.

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A high-quality monthly pan evaporation dataset for Australia

Cited by 50 publications

References 27 publications

A critical overview of pan evaporation trends over the last 50 years

A critical overview of pan evaporation trends over the last 50 years

A high-quality monthly total cloud amount dataset for Australia

A review of recent climate variability and climate change in southeastern Australia

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