An intense precipitation event causes a temperate forested drainage network to shift from N 2 O source to sink

2022 ◽  
Author(s):  
Kelly S. Aho ◽  
Jennifer H. Fair ◽  
Jake D. Hosen ◽  
Ethan D. Kyzivat ◽  
Laura A. Logozzo ◽  
...  
Keyword(s):  
Precipitation Event ◽  
Drainage Network ◽  
Intense Precipitation ◽  
Source To Sink

scholarly journals The mobility of Atlantic baric depressions leading to intense precipitation over Italy: a preliminary statistical analysis

2006 ◽  
Vol 6 (3) ◽  
pp. 451-458 ◽  
Author(s):  
N. Tartaglione ◽  
A. Speranza ◽  
F. Dalan ◽  
T. Nanni ◽  
M. Brunetti ◽  
...  
Keyword(s):  
Principal Component ◽  
Rain Gauge ◽  
Western Mediterranean ◽  
Precipitation Event ◽  
Rain Gauge Data ◽  
Intense Precipitation ◽  
Western Mediterranean Basin ◽  
Italian Regions ◽  
Autumn And Winter

Abstract. The speed of Atlantic surface depressions, occurred during the autumn and winter seasons and that lead to intense precipitation over Italy from 1951 to 2000, was investigated. Italy was divided into 5 regions as documented in previous climatological studies (based on Principal Component Analysis). Intense precipitation events were selected on the basis of in situ rain gauge data and clustered according to the region that they hit. For each intense precipitation event we tried to identify an associated surface depression and we tracked it, within a large domain covering the Mediterranean and Atlantic regions, from its formation to cyclolysis in order to estimate its speed. "Depression speeds" were estimated with 6-h resolution and clustered into slow and non-slow classes by means of a threshold, coinciding with the first quartile of speed distribution and depression centre speeds were associated with their positions. Slow speeds occurring over an area including Italy and the western Mediterranean basin showed frequencies higher than 25%, for all the Italian regions but one. The probability of obtaining by chance the observed more than 25% success rate was estimated by means of a binomial distribution. The statistical reliability of the result is confirmed for only one region. For Italy as a whole, results were confirmed at 95% confidence level. Stability of the statistical inference, with respect to errors in estimating depression speed and changes in the threshold of slow depressions, was analysed and essentially confirmed the previous results.

scholarly journals Synoptic climatology of winter intense precipitation events along the Mediterranean coasts

2013 ◽  
Vol 13 (7) ◽  
pp. 1707-1722 ◽  
Author(s):  
M. Reale ◽  
P. Lionello
Keyword(s):  
Eastern Mediterranean ◽  
Reanalysis Data ◽  
Western Mediterranean ◽  
Teleconnection Pattern ◽  
Mediterranean Coast ◽  
Synoptic Climatology ◽  
Precipitation Event ◽  
Intense Precipitation ◽  
The Mediterranean ◽  
Precipitation Events

Abstract. The link between winter (December-January-February) precipitation events at 15 Mediterranean coastal locations and synoptic features (cyclones and Northern Hemisphere teleconnection patterns) is analyzed. A list of precipitation events has been produced; q percentile thresholds (Thq) and corresponding frequency Nq (for q equal to 25, 50, 90 and 98) have been considered. A negative trend has been detected in total precipitation and N50 at many locations, while no significant trend in N25, N90 and N98 has been found. The negative phase of the North Atlantic Oscillation (NAO) and the East Atlantic/West Russia pattern (EAWR) compete for exerting the largest influence on the frequency of the 25th, 50th and 90th percentiles, with EAWR and NAO exerting their largest influence in the central and western Mediterranean areas, respectively. All percentiles show a similar behavior except for the 98th percentile, which shows no convincing link to any teleconnection pattern. The cyclone tracks that are associated with precipitation events have been selected using the ERA-40 reanalysis data, and a strong link between intense precipitation and cyclones is shown for all stations. In general, the probability of detecting a cyclone within a distance of 20° from each station increases with the intensity of the precipitation event and decreases with the duration of a dry period. The origin and track of cyclones producing intense precipitation differ among different areas. When precipitation occurs in the northwestern Mediterranean, cyclones are generally either of Atlantic origin or secondary cyclones associated with the passage of major cyclones north of the Mediterranean Basin, while they are mostly generated inside the region itself for events at the eastern Mediterranean coast. An important fraction of intense events in the southern areas is produced by cyclones that are generated over northern Africa. The analysis of sea level pressure and geopotential height at 500 hPa highlights the important role of cyclone depth, circulation strength, surrounding synoptic condition, and of slow speed of the cyclone center for producing intense precipitation events.

scholarly journals Microphysics and dynamics of snowfall associated with a warm conveyor belt over Korea

2020 ◽  
Vol 20 (12) ◽  
pp. 7373-7392 ◽  
Author(s):  
Josué Gehring ◽  
Annika Oertel ◽  
Étienne Vignon ◽  
Nicolas Jullien ◽  
Nikola Besic ◽  
...  
Keyword(s):  
Large Scale ◽  
Lower Boundary ◽  
Conveyor Belt ◽  
Precipitation Event ◽  
Large Scale Circulation ◽  
Differential Phase Shift ◽  
Intense Precipitation ◽  
Subsequent Decrease ◽  
Synoptic Conditions ◽  
Differential Reflectivity

Abstract. On 28 February 2018, 57 mm of precipitation associated with a warm conveyor belt (WCB) fell within 21 h over South Korea. To investigate how the large-scale circulation influenced the microphysics of this intense precipitation event, we used radar measurements, snowflake photographs and radiosounding data from the International Collaborative Experiments for Pyeongchang 2018 Olympic and Paralympic Winter Games (ICE-POP 2018). The WCB was identified with trajectories computed with analysis wind fields from the Integrated Forecast System global atmospheric model. The WCB was collocated with a zone of enhanced wind speed of up to 45 m s−1 at 6500 m a.s.l., as measured by a radiosonde and a Doppler radar. Supercooled liquid water (SLW) with concentrations exceeding 0.2 g kg−1 was produced during the rapid ascent within the WCB. During the most intense precipitation period, vertical profiles of polarimetric radar variables show a peak and subsequent decrease in differential reflectivity as aggregation starts. Below the peak in differential reflectivity, the specific differential phase shift continues to increase, indicating early riming of oblate crystals and secondary ice generation. We hypothesise that the SLW produced in the WCB led to intense riming. Moreover, embedded updraughts in the WCB and turbulence at its lower boundary enhanced aggregation by increasing the probability of collisions between particles. This suggests that both aggregation and riming occurred prominently in this WCB. This case study shows how the large-scale atmospheric flow of a WCB provides ideal conditions for rapid precipitation growth involving SLW production, riming and aggregation. Future microphysical studies should also investigate the synoptic conditions to understand how observed processes in clouds are related to large-scale circulation.

scholarly journals Microphysics and dynamics of snowfall associated to a warm conveyor belt over Korea

2020 ◽  
Author(s):  
Josué Gehring ◽  
Annika Oertel ◽  
Étienne Vignon ◽  
Nicolas Jullien ◽  
Nikola Besic ◽  
...  
Keyword(s):  
Large Scale ◽  
Lower Boundary ◽  
Conveyor Belt ◽  
Precipitation Event ◽  
Large Scale Circulation ◽  
Differential Phase Shift ◽  
Intense Precipitation ◽  
Subsequent Decrease ◽  
Synoptic Conditions ◽  
Differential Reflectivity

Abstract. On 28 February 2018, 57 mm of precipitation associated to a warm conveyor belt (WCB) fell within 21 h over South Korea. To investigate how the large-scale circulation influenced the microphysics of this intense precipitation event, we used radar measurements, snowflake photographs and radiosounding data from the International Collaborative Experiments for Pyeongchang 2018 Olympic and Paralympic winter games. The WCB was identified with trajectories computed with analysis wind fields from the Integrated Forecast System global atmospheric model. The WCB was collocated with a zone of enhanced wind speed of up to 45 m s−1 at 6500 m a.s.l., as measured by a radiosonde and a Doppler radar. Supercooled liquid water (SLW) with concentrations exceeding 0.2 g kg−1 was produced during the rapid ascent within the WCB. Vertical profiles of polarimetric radar variables show during the most intense precipitation period a peak and subsequent decrease in differential reflectivity as aggregation starts. Below the peak in differential reflectivity, the specific differential phase shift continues to increase, indicating early riming of oblate crystals and secondary ice generation. We hypothesise that the SLW produced in the WCB led to intense riming. Moreover, embedded convection in the WCB and turbulence at its lower boundary enhanced aggregation by increasing the probability of collisions between particles. This suggests that both aggregation and riming occurred prominently in this WCB. This case study shows how the large-scale atmospheric flow of a WCB provides ideal conditions for rapid precipitation growth involving SLW production, riming and aggregation. Future microphysical studies should also investigate the synoptic conditions to understand how observed processes in clouds are related to the large-scale circulation.

scholarly journals Downscaling an intense precipitation event in complex terrain: the importance of high grid resolution

2017 ◽  
Vol 69 (1) ◽  
pp. 1271561 ◽  
Author(s):  
Marie Pontoppidan ◽  
Joachim Reuder ◽  
Stephanie Mayer ◽  
Erik W. Kolstad
Keyword(s):  
Complex Terrain ◽  
Grid Resolution ◽  
Precipitation Event ◽  
Intense Precipitation

scholarly journals Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

2017 ◽  
Author(s):  
Arnaud Vacherat ◽  
Stéphane Bonnet ◽  
Frédéric Mouthereau
Keyword(s):  
Landscape Evolution ◽  
External Control ◽  
Strong Impact ◽  
Drainage Network ◽  
Ebro Basin ◽  
The North ◽  
Early Oligocene ◽  
Sediment Routing ◽  
Duero Basin ◽  
Source To Sink

Abstract. Intracontinental endorheic basins are key elements of source-to-sink systems as they preserve sediments eroded from surrounding catchments. Drainage reorganization in such a basin has strong implications on the sediment routing system and on the landscape evolution at a cratonic scale. The Ebro and Duero basins in the north Iberian plate represent two foreland basins, which were filled in relation with the growing of surrounding compressional orogens as the Pyrenees and the Cantabrian mountains to the north, the Iberian and Central Ranges to the south, and the Catalan Coastal Range to the east. They were once connected as endorheic basins in the Early Oligocene. By the end of the Miocene, they were disconnected and started to flow into the Mediterranean Sea and the Atlantic Ocean, respectively, in a post-orogenic context. Although these two hydrographic basins recorded similar histories, they are characterized by very different morphologic features. The Ebro basin is highly excavated, whereas the Duero basin is well preserved and may be considered as almost still endorheic. These two bordering basins then show contrasting preservation states of their endorheic stages and represent an ideal natural laboratory to study what factors (internal / external) control drainage divide mobility, and drainage network and landscape evolution in post-orogenic basins. To that aim, we use field and map observations and we apply the Chi-analysis of river profiles across the divide along the boundary between the Ebro and Duero drainage basins in the Northern Iberian Peninsula to evaluate the migration of their divide. We show here that contrasting excavation of the Ebro and Duero basins drives a reorganization of their drainage network through a series of captures and resulted in the southwestward migration of their main drainage divide. Fluvial captures have strong impact on drainage areas, fluxes, and so on incision capacity, especially for the captured basin. Thus, we conclude that drainage reorganization, and capture of the Duero rivers by the Ebro ones, independently from tectonics and climate, enable endorheism in the Duero basin due to drainage area loss.

Numerical modeling of an intense precipitation event and its associated lightning activity over northern Greece

2016 ◽  
Vol 169 ◽  
pp. 523-538 ◽  
Author(s):  
I. Pytharoulis ◽  
S. Kotsopoulos ◽  
I. Tegoulias ◽  
S. Kartsios ◽  
D. Bampzelis ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Lightning Activity ◽  
Precipitation Event ◽  
Northern Greece ◽  
Intense Precipitation

scholarly journals Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

2018 ◽  
Vol 6 (2) ◽  
pp. 369-387 ◽  
Author(s):  
Arnaud Vacherat ◽  
Stéphane Bonnet ◽  
Frédéric Mouthereau
Keyword(s):  
Landscape Evolution ◽  
Drainage System ◽  
Strong Impact ◽  
Drainage Network ◽  
Ebro Basin ◽  
The North ◽  
Early Oligocene ◽  
Sediment Routing ◽  
Duero Basin ◽  
Source To Sink

Abstract. Intracontinental endorheic basins are key elements of source-to-sink systems as they preserve sediments eroded from the surrounding catchments. Drainage reorganization in such a basin in response to changing boundary conditions has strong implications on the sediment routing system and on landscape evolution. The Ebro and Duero basins represent two foreland basins, which developed in response to the growth of surrounding compressional orogens, the Pyrenees and the Cantabrian mountains to the north, the Iberian Ranges to the south, and the Catalan Coastal Range to the east. They were once connected as endorheic basins in the early Oligocene. By the end of the Miocene, new post-orogenic conditions led to the current setting in which the Ebro and Duero basins are flowing in opposite directions, towards the Mediterranean Sea and the Atlantic Ocean. Although these two hydrographic basins recorded a similar history, they are characterized by very different morphologic features. The Ebro basin is highly excavated, whereas relicts of the endorheic stage are very well preserved in the Duero basin. The contrasting morphological preservation of the endorheic stage represents an ideal natural laboratory to study the drivers (internal and/or external) of post-orogenic drainage divide mobility, drainage network, and landscape evolution. To that aim, we use field and map observations and we apply the χ analysis of river profiles along the divide between the Ebro and Duero drainage basins. We show here that the contrasting excavation of the Ebro and Duero basins drives a reorganization of their drainage network through a series of captures, which resulted in the southwestward migration of their main drainage divide. Fluvial captures have a strong impact on drainage areas, fluxes, and their respective incision capacity. We conclude that drainage reorganization driven by the capture of the Duero basin rivers by the Ebro drainage system explains the first-order preservation of endorheic stage remnants in the Duero basin, due to drainage area loss, independently from tectonics and climate.

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