Long-term pan evaporation observations as a resource to understand the water cycle trend: case studies from Australia     

E. Lugato  G. Alberti  B. Gioli  J.O. Kaplan  A. Peressotti  F. Miglietta 《水文科学杂志》2013,58(6):1287-1296

Abstract

Acceleration of the global water cycle over recent decades remains uncertain because of the high inter-annual variability of its components. Observations of pan evaporation (E_pan), a proxy of potential evapotranspiration (ET_p), may help to identify trends in the water cycle over long periods. The complementary relationship (CR) states that ET_p and actual evapotranspiration (ET_a) depend on each other in a complementary manner, through land–atmosphere feedbacks in water-limited environments. Using a long-term series of E_pan observations in Australia, we estimated monthly ET_a by the CR and compared our estimates with ET_a measured at eddy covariance Fluxnet stations. The results confirm that our approach, entirely data-driven, can reliably estimate ET_a only in water-limited conditions. Furthermore, our analysis indicated that ET_a did not show any significant trend in the last 30 years, while short-term analysis may indicate a rapid climate change that is not perceived in a long-term perspective.

Editor Z.W. Kundzewicz; Associate editor D. Gerten

Citation Lugato, E., Alberti, G., Gioli. B., Kaplan, J.O., Peressotti, A., and Miglietta, F., 2013. Long-term pan evaporation observations as a resource to understand the water cycle trend: case studies from Australia. Hydrological Sciences Journal, 58 (6), 1287–1296.  相似文献   

Resting Stages of Plankton in Recent North Adriatic Sediments   总被引：6，自引：0，他引：6  

Fernando Rubino  Genuario Belmonte  Anna M. Miglietta  Sebastiano Geraci  & Ferdinando Boero 《Marine Ecology》2000,21(3-4):263-284

Abstract. Plankton-derived resting stages were found in 26 sediment cores collected in the North Adriatic Sea; 46 morphotypes were identified, 38 were attributed to taxa according to their morphology and, in some hatching cases, also according to the morphology of the derived active forms. Six species of Dinophyta were recorded for the first time from the North Adriatic Sea. Each morphotype was described in detail. Twenty-nine resting stages were Dinophyta; one was a Chrysophyta; two were Tintinnina; and six were metazoans. At every site Dinophyta cysts were more abundant than Metazoa cysts. Cyst bank densities were variable, with empty forms generally more abundant than full ones; cyst concentrations were highest at the mouth of the Po River delta.  相似文献   

Discharge prediction based on multi-model precipitation forecasts   总被引：3，自引：0，他引：3  

T. Diomede  S. Davolio  C. Marsigli  M. M. Miglietta  A. Moscatello  P. Papetti  T. Paccagnella  A. Buzzi  P. Malguzzi 《Meteorology and Atmospheric Physics》2008,101(3-4):245-265

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Climatology of dust days in the Central Plateau of Iran     

Mesbahzadeh  Tayyebeh  Salajeghe  Ali  Sardoo  Farshad Soleimani  Zehtabian  Gholamreza  Ranjbar  Abbas  Krakauer  Nir Y.  Miglietta  Mario Marcello  Mirakbari  Maryam 《Natural Hazards》2020,104(2):1801-1817

Natural Hazards - Dust storms are a major natural hazard to human health. Severe erosive storms in parts of the Central Plateau of Iran have made the situation very difficult for the inhabitants,...  相似文献   

The Growth of the Planetary Boundary Layer at a Coastal Site: a Case Study   总被引：2，自引：1，他引：1  

Ferdinando De Tomasi  M. Marcello Miglietta  M. Rita Perrone 《Boundary-Layer Meteorology》2011,139(3):521-541

A lidar system is used to determine the diurnal evolution of the planetary boundary layer (PBL) height on a summer day characterized by anticyclonic conditions. The site is located some 15 km distant from the sea, on a peninsula in south-east Italy. Contrary to expectations, the PBL height, after an initial growth consequent to sunrise, ceases to increase about 2 h before noon and then decreases and stabilizes in the afternoon. An interpretation of such anomalous behaviour is provided in terms of trajectories of air parcels towards the lidar site, which are influenced by the sea breeze, leading to a transition from a continental boundary layer to a coastal internal boundary layer. The results are analyzed using mesoscale numerical model simulations and a simple model that allows for a more direct interpretation of experimental results.  相似文献   

Quality analysis applied on eddy covariance measurements at complex forest sites using footprint modelling   总被引：7，自引：0，他引：7  

C. Rebmann  M. Göckede  T. Foken  M. Aubinet  M. Aurela  P. Berbigier  C. Bernhofer  N. Buchmann  A. Carrara  A. Cescatti  R. Ceulemans  R. Clement  J. A. Elbers  A. Granier  T. Grünwald  D. Guyon  K. Havránková  B. Heinesch  A. Knohl  T. Laurila  B. Longdoz  B. Marcolla  T. Markkanen  F. Miglietta  J. Moncrieff  L. Montagnani  E. Moors  M. Nardino  J.-M. Ourcival  S. Rambal  Ü. Rannik  E. Rotenberg  P. Sedlak  G. Unterhuber  T. Vesala  D. Yakir 《Theoretical and Applied Climatology》2005,80(2-4):121-141

Summary Measuring turbulent fluxes with the eddy covariance method has become a widely accepted and powerful tool for the determination of long term data sets for the exchange of momentum, sensible and latent heat, and trace gases such as CO₂ between the atmosphere and the underlying surface. Several flux networks developed continuous measurements above complex terrain, e.g. AmeriFlux and EUROFLUX, with a strong focus on the net exchange of CO₂ between the atmosphere and the underlying surface. Under many conditions basic assumptions for the eddy covariance method in its simplified form, such as stationarity of the flow, homogeneity of the surface and fully developed turbulence of the flow field, are not fulfilled. To deal with non-ideal conditions which are common at many FLUXNET sites, quality tests have been developed to check if these basic theoretical assumptions are valid.In the framework of the CARBOEUROFLUX project, we combined quality tests described by Foken and Wichura (1996) with the analytical footprint model of Schmid (1997). The aim was to identify suitable wind sectors and meteorological conditions for flux measurements. These tools were used on data of 18 participating sites. Quality tests were applied on the fluxes of momentum, sensible and latent heat, and on the CO₂-flux, respectively. The influence of the topography on the vertical wind component was also checked. At many sites the land use around the flux towers is not homogeneous or the fetch may not be large enough. So the relative contribution of the land use type intended to be measured was also investigated. Thus the developed tool allows comparative investigations of the measured turbulent fluxes at different sites if using the same technique and algorithms for the determination of the fluxes as well as analyses of potential problems caused by influences of the surrounding land use patterns.  相似文献   

Tornadoes in Southern Apulia (Italy)     

F.?GianfredaEmail author  M.?M.?Miglietta  P.?Sansò 《Natural Hazards》2005,34(1):71-89

Numerous tornadoes have traversed southern Apulia in the course of the last five centuries, causing severe damage and a significant loss of life. Historical chronicles and newspaper articles allowed more than 30 tornadic events to be identified; in particular, 26 of these have occurred during the last two centuries. In all, 24 small towns and villages of southern Apulia suffered on at least one occasion the disastrous effects of being hit by a tornado.Collated data reveals that tornadoes generally form from May to December, with the most powerful events taking place in the month of September, followed by October and November. Tornadoes generally cluster in the southernmost area of the region and typically follow a path leading from the south-west to the north-east. Path length were observed to vary from 8 to 73km, and widths ranging from 60 to 850m.The metereological analysis carried out for the events occurred after 1950, even if based on a limited data set, reveals a few typical meteorological scenarios associated with the development of tornadoes over Salento.In southern Apulia tornadoes can be classified from levels A2 to A4 in accordance with the Damage Area Scale.  相似文献