scholarly journals A 10-Year Study on the Characteristics of Thunderstorms in Belgium Based on Cloud-to-Ground Lightning Data

2014 ◽  
Vol 142 (12) ◽  
pp. 4839-4849 ◽  
Author(s):  
Dieter R. Poelman
Keyword(s):  
Cell Tracking ◽  
Total Activity ◽  
The West ◽  
European Cooperation ◽  
Lightning Detection ◽  
Cloud To Ground Lightning ◽  
A Cell ◽  
Direction Of Movement ◽  
Temporal And Spatial ◽  
The Individual

Abstract Temporal and spatial distributions of cloud-to-ground (CG) lightning in Belgium are analyzed. Based on data from the European Cooperation for Lightning Detection (EUCLID) network, spanning a period of 10 years between 2004 and 2013, mean CG flash densities vary between 0.3 km−2 yr−1 in the west up to 2.4 km−2 yr−1 toward the east of Belgium, with an average flash density of 0.7 km−2 yr−1. The same behavior is found in terms of thunderstorm days and hours, where in the east most of the activity is observed, with a drop-off toward the coast. The majority of lightning activity takes place in the summer months between May and August, accounting for nearly 90% of the total activity. Furthermore, the thunderstorm season reaches its highest activity in July in terms of CG detections, while the diurnal cycle peaks between 1500 and 1600 UTC. A correlation is found between the estimated peak currents and altitude, with on average higher absolute peak currents at lower elevations and vice versa. In addition, a cell tracking algorithm is applied to the data to monitor the behavior of the individual cells. It is found that the lightning cells travel at an average speed of about 25 km h−1, with a preferred northeasterly direction of movement. At last, CG flash rates are strongly related to the cell area.

scholarly journals Cell-tracking with lightning data from LINET

2008 ◽  
Vol 17 ◽  
pp. 55-61 ◽  
Author(s):  
H. D. Betz ◽  
K. Schmidt ◽  
W. P. Oettinger ◽  
B. Montag
Keyword(s):  
Cell Tracking ◽  
Planning Stage ◽  
Lightning Detection ◽  
University Of Munich ◽  
A Cell ◽  
Storm Cells ◽  
Total Lightning ◽  
Convective Cells ◽  
The University ◽  
Tracking Module

Abstract. A new lightning detection network (LINET) has been developed at the University of Munich, which locates and reports both cloud discharges and cloud-to-ground strokes with high accuracy. The network started operation in May 2006; since then lightning data for Europe are being delivered to many scientific groups, and to the German Weather Service (DWD) on an operational basis (powered by nowcast GmbH, Germany). Using about 90 lightning sensors in 17 countries, an area from longitude 10° W–25° E to latitude 35° N–65° N is covered. Further expansion is in the planning stage with the aim to attain higher efficiency for Mediterranean storms. The total lightning capability, not readily available otherwise in large areas, is particularly helpful because it can provide useful information about the development of severe weather and strong storm cells. A cell-tracking module has been developed that allows the investigation of lightning parameters for specific convective cells. Present efforts are devoted to the question for what kind of storms and to what extent lightning-based cell tracking allows improved nowcasting. Numerous case studies have been carried out and typical examples will be presented.

scholarly journals Performance Characteristics of Distinct Lightning Detection Networks Covering Belgium

2013 ◽  
Vol 30 (5) ◽  
pp. 942-951 ◽  
Author(s):  
Dieter R. Poelman ◽  
Wolfgang Schulz ◽  
Christian Vergeiner
Keyword(s):  
High Speed ◽  
Detection Efficiency ◽  
Field Measurements ◽  
Ground Truth ◽  
Location Accuracy ◽  
Lightning Detection ◽  
Cloud To Ground Lightning ◽  
The Individual ◽  
Electric Field Measurements ◽  
Meteorological Institute

Abstract This study reports results from electric field measurements coupled to high-speed camera observations of cloud-to-ground lightning to test the performance of lightning location networks in terms of its detection efficiency and location accuracy. The measurements were carried out in August 2011 in Belgium, during which 57 negative cloud-to-ground flashes, with a total of 210 strokes, were recorded. One of these flashes was followed by a continuing current of over 1 s—one of the longest ever observed in natural negative cloud-to-ground lightning. Lightning data gathered from the lightning detection network operated by the Royal Meteorological Institute of Belgium [consisting of a network employing solely Surveillance et Alerte Foudre par Interférométrie Radioélectrique (SAFIR) sensors and a network combining SAFIR and LS sensors], the European Cooperation for Lightning Detection (EUCLID), Vaisala’s Global Lightning Detection network GLD360, and the Met Office’s long-range Arrival Time Difference network (ATDnet) are evaluated against this ground-truth dataset. It is found that all networks are capable of detecting over 90% of the observed flashes, but a larger spread is observed at the level of the individual strokes. The median location accuracy varies between 0.6 and 1 km, except for the SAFIR network, locating the ground contacts with 6.1-km median accuracy. The same holds for the reported peak currents, where a good correlation is found among the networks that provide peak current estimates, apart from the SAFIR network being off by a factor of 3.

scholarly journals Radar Nowcasting of Cloud-to-Ground Lightning over Houston, Texas

2011 ◽  
Vol 26 (2) ◽  
pp. 199-212 ◽  
Author(s):  
Richard M. Mosier ◽  
Courtney Schumacher ◽  
Richard E. Orville ◽  
Lawrence D. Carey
Keyword(s):  
Convective Cell ◽  
Lead Times ◽  
Lightning Flash ◽  
Critical Success ◽  
Lightning Detection ◽  
Doppler Data ◽  
Cloud To Ground Lightning ◽  
A Cell ◽  
Convective Cells ◽  
Critical Success Index

Abstract Ten years (1997–2006) of summer (June–August) daytime (1400–0000 UTC) Weather Surveillance Radar-1988 Doppler data for Houston, Texas, were examined to determine the best radar-derived predictors of the first cloud-to-ground lightning flash from a convective cell. Convective cells were tracked using a modified version of the Storm Cell Identification and Tracking (SCIT) algorithm and then correlated to cloud-to-ground lightning data from the National Lightning Detection Network (NLDN). Combinations of three radar reflectivity values (30, 35, and 40 dBZ) at four isothermal levels (−10°, −15°, −20°, and updraft −10°C) and a new radar-derived product, vertically integrated ice (VII), were used to optimize a radar-based lightning forecast algorithm. Forecasts were also delineated by range and the number of times a cell was identified and tracked by the modified SCIT algorithm. This study objectively analyzed 67 384 unique cells and 1 028 510 lightning flashes to find the best lightning forecast criteria. Results show that using 30 dBZ at the −15° or −20°C isotherm on cells within 75 km of the radar that have been tracked for at least two consecutive scans produces the best lightning forecasts with a critical success index (CSI) of 0.68. The best VII predictor values were 0.42 or 0.58 kg m−2 on cells within 75 km of the radar that have been tracked for at least two consecutive scans, producing a CSI of 0.67. Lead times for these predictors were 10.0 and 13.4 min, respectively. Lead times greater than 10 min occurred with less stringent predictors (e.g., 30 dBZ at −10°C or VII greater than 0.25 kg m−2 on cells within 125 km with a minimum track count of 2), but lower CSI values result. In general, cells tracked for multiple scans provide higher CSIs and lead times than decreasing the range from the radar or changing the reflectivity threshold and height.

Nonspecific Chronic Back Pain: Sixth Edition Approaches

2019 ◽  
Vol 24 (5) ◽  
pp. 14-15
Author(s):  
Jay Blaisdell ◽  
James B. Talmage
Keyword(s):  
Back Pain ◽  
Chronic Back Pain ◽  
Intervertebral Disk ◽  
Key Factors ◽  
Sixth Edition ◽  
Whole Person ◽  
Class 1 ◽  
A Cell ◽  
Intervertebral Disk Herniation ◽  
The Individual

Abstract Ratings for “non-specific chronic, or chronic reoccurring, back pain” are based on the diagnosis-based impairment method whereby an impairment class, usually representing a range of impairment values within a cell of a grid, is selected by diagnosis and “specific criteria” (key factors). Within the impairment class, the default impairment value then can be modified using non-key factors or “grade modifiers” such as functional history, physical examination, and clinical studies using the net adjustment formula. The diagnosis of “nonspecific chronic, or chronic reoccurring, back pain” can be rated in class 0 and 1; the former has a default value of 0%, and the latter has a default value of 2% before any modifications. The key concept here is that the physician believes that the patient is experiencing pain, yet there are no related objective findings, most notably radiculopathy as distinguished from “nonverifiable radicular complaints.” If the individual is found not to have radiculopathy and the medical record shows that the patient has never had clinically verifiable radiculopathy, then the diagnosis of “intervertebral disk herniation and/or AOMSI [alteration of motion segment integrity] cannot be used.” If the patient is asymptomatic at maximum medical improvement, then impairment Class 0 should be chosen, not Class 1; a final whole person impairment rating of 1% indicates incorrect use of the methodology.

Governance and Corruption

2002 ◽  
Vol 19 (2) ◽  
pp. 1-33 ◽  
Author(s):  
Zafar Iqbal
Keyword(s):  
Economic Growth ◽  
Remedial Action ◽  
The West ◽  
Scientific Thought ◽  
Moral Virtues ◽  
Order Preference ◽  
Rational Understanding ◽  
Social Scientific ◽  
Character Building ◽  
The Individual

This paper compares the Islamic and the western social scien­tific perspectives on corruption. Jt is argued that the emerging shift in social scientific thought in viewing corruption from "grease that oils the economic wheel" to a "menace that under­mines economic growth" has brought rational understanding of the phenomenon much closer to [slamic doctrine. Where they differ is with respect to remedial action. The western approach focuses on governance and designing appropriate systems and institutions that gear information and incentives toward minimiz­ing opportunities and enticement for corruption. In short, it emphasizes constraints external to the individual. By comparison, Islam seeks to go beyond such constraints, and also instill in believers a clear "second-order" preference for non­corrupt behavior. lt recommends developing a firm belief in transcendent accountability, stresses character building through practicing moral virtues and shunning vices. In essence, much of the restraint comes from within through a moral renovation. rt is our contention that both emphases are important in eliminating corruption and that the followers oflslam and the West can learn from one another.

scholarly journals Temporal and spatial patterns on serra, Scomberomorus brasiliensis (Teleostei, Scombridae), catches from the fisheries on the Maranhão coast, Brazil

2001 ◽  
Vol 61 (4) ◽  
pp. 541-546 ◽  
Author(s):  
V. da BATISTA ◽  
N. N. FABRÉ
Keyword(s):  
Spatial Patterns ◽  
Relative Abundance ◽  
West Coast ◽  
The West ◽  
Temporal And Spatial Patterns ◽  
Eastern Brazil ◽  
North Eastern ◽  
Displacement Pattern ◽  
Temporal And Spatial ◽  
Demersal Species

The displacement pattern of the serra, Scomberomorus brasiliensis, in North-eastern Brazil was analyzed from landing data recorded from the fleet fishing serra. Serra fishery has two seasons: from September to February (demersal species plus serra), and from March to August (almost only large amounts of serra). S. brasiliensis relative abundance increases similarly along the coast from March, but decreases first on the West coast from June. Records indicate that serra is near the coast at least until September/October in Eastern grounds. From October to March (strongest spawning season) there is no record of shoals on the coast. We concluded that the Maranhão coast is just a part of the migration circuit of S. brasiliensis that may exceed 300 nautical miles.

scholarly journals Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH<sub>4</sub>, CO<sub>2</sub> and N<sub>2</sub>O

2006 ◽  
Vol 6 (7) ◽  
pp. 1953-1976 ◽  
Author(s):  
B. Dils ◽  
M. De Mazière ◽  
J. F. Müller ◽  
T. Blumenstock ◽  
M. Buchwitz ◽  
...  
Keyword(s):  
Near Infrared ◽  
Polynomial Interpolation ◽  
Global Network ◽  
Target Species ◽  
Time Period ◽  
Order Polynomial ◽  
Temporal And Spatial ◽  
The Individual ◽  
Near Future ◽  
Total Column

Abstract. Total column amounts of CO, CH4, CO2 and N2O retrieved from SCIAMACHY nadir observations in its near-infrared channels have been compared to data from a ground-based quasi-global network of Fourier-transform infrared (FTIR) spectrometers. The SCIAMACHY data considered here have been produced by three different retrieval algorithms, WFM-DOAS (version 0.5 for CO and CH4 and version 0.4 for CO2 and N2O), IMAP-DOAS (version 1.1 and 0.9 (for CO)) and IMLM (version 6.3) and cover the January to December 2003 time period. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of reliable coincidences that satisfy the temporal and spatial collocation criteria, the SCIAMACHY data have been compared with a temporal 3rd order polynomial interpolation of the ground-based data. Particular attention has been given to the question whether SCIAMACHY observes correctly the seasonal and latitudinal variability of the target species. The present results indicate that the individual SCIAMACHY data obtained with the actual versions of the algorithms have been significantly improved, but that the quality requirements, for estimating emissions on regional scales, are not yet met. Nevertheless, possible directions for further algorithm upgrades have been identified which should result in more reliable data products in a near future.

Assyrian sacred trees in the Brooklyn Museum

Iraq ◽  
1994 ◽  
Vol 56 ◽  
pp. 123-133 ◽  
Author(s):  
Pauline Albenda
Keyword(s):  
Present Author ◽  
Ninth Century ◽  
Palm Tree ◽  
The West ◽  
Individual Tree ◽  
Sacred Tree ◽  
The Individual ◽  
Individual Trees ◽  
Brooklyn Museum ◽  
Tree Type

The Brooklyn Museum houses twelve stone slabs with carved decoration from the Northwest Palace of Ashurnasirpal II. The motif of a stylized tree — the so-called Sacred Tree (see Figs. 1, 4, 6) — appears on seven of those slabs which come from rooms F, I, L, S, T of the ninth century palace at Nimrud. These tree renderings are representative of the sacred tree-type found in ten rooms of the royal residence and the west wing. Approximately 96 sacred trees, in two-register arrangement, appeared on the pictorial decorations in room I; the same motif occurred about 75 times in one-register arrangement on the reliefs of the other rooms. The abundance of the sacred tree motif on the wall decorations of the Northwest Palace attests to the significance of this plant. Its design deserves investigation; in Layard's words, “the tree, evidently a sacred symbol, is elaborately and tastefully formed.”In his study of the Ashurnasirpal II reliefs in American collections, Stearns did not attempt to list the sacred trees, because “variations in the sacred tree occur only in minor details,” and “the tree in itself is rarely useful in identifying the location of the reliefs.” These statements make clear Stearns' belief that the sacred trees were nearly alike. Other scholars, notably Weidner and Reade, have pointed out that on a number of slabs now in American and European museums are carvings of matching half trees, therefore indicating that when paired, these trees belonged to adjoining slabs originally. In trying to match half trees, one finds that individual sacred trees do differ in the rendering of specific details. Bleibtreu, in her analysis of the sacred tree-type, lists three variants of the flower found on the palmette-garland framing the individual tree on three sides. The present author, after examining the sacred trees carved on the slabs in The Brooklyn Museum, concludes that the design of the tree-type is more varied than heretofore presumed, and that its construction is more complex than indicated in previous descriptions of the subjects. An analysis of the Assyrian sacred tree-type may lead to possible conclusions regarding its intended image: a stylized palm tree, a cult object, an emblem of vegetation or “tree of life”, an imperial symbol, or a combination of those forms. In addition, one may consider to what extent the rendering of individual trees was the consequence of artistic inventiveness.

scholarly journals The Insula of the Menander at Pompeii: Interim Report

1983 ◽  
Vol 63 (1) ◽  
pp. 34-57 ◽  
Author(s):  
Roger Ling
Keyword(s):  
General Trend ◽  
Fourth Century ◽  
Phase 2 ◽  
Interim Report ◽  
The West ◽  
Phase 3 ◽  
Living Space ◽  
Economic Basis ◽  
The Individual ◽  
The City

SummaryA British team has been working since 1978 upon a programme of documentation and analysis in the Insula of the Menander at Pompeii, one of the irregular city-blocks situated immediately to the west of the old part of the city in an area which was developed from the early fourth century B.C onwards. Study of the structural techniques, of wall-abutments, and of anomalies in plan can be used in conjunction with the evidence of painted wall-plaster to identify five main phases in the building-history: Phase I (fourth-third centuries B.C), Phase 2 (second and early first centuries B.C), Phase 3 (c. 80-c. 15 B.C), Phase 4 (c. 15 B.C.-C. A.D. 50), Phase 5 (c. A.D. 50-79). These illustrate a complex pattern of changing property-boundaries, but underline the general trend towards increasing commercialization and greater pressure upon living-space in this area of the city. There is also interesting evidence of the economic basis of life in the individual houses during the years immediately before 79.

scholarly journals Impact of Climate Change on Crop & Predict the Disease

2021 ◽  
Vol 9 (VI) ◽  
pp. 3063-3070
Author(s):  
Shraddha S. Garud
Keyword(s):  
Climate Change ◽  
Growth And Development ◽  
Climate Changes ◽  
Plant Diseases ◽  
Life Stages ◽  
Social Changes ◽  
Temporal And Spatial Distribution ◽  
Climate Influences ◽  
Temporal And Spatial ◽  
The Individual

The prime need of this world is that the simplest agriculture which decides the event of each country because the survival of the individual is completely obsessed with farming and its best production. Climate changes are in response to changes within the hydrosphere, biosphere, and other atmospheric and interacting factors. Human activities driven by demographic, economic, technological, and social changes have a big impact on activity. The climate influences the incidence further as the temporal and spatial distribution of plant diseases. the foremost factors that control the growth and development of diseases are temperature, light, and water. Climate affects all life stages of the pathogen and host and poses a challenge to many pathosystems. The environmental change, especially when combined with the pathogen and host introductions, may cause unprecedented effects.

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