scholarly journals Defining the north Australian monsoon onset: A systematic review

2019 ◽  
Vol 44 (3) ◽  
pp. 398-418
Author(s):  
Joel Lisonbee ◽  
Joachim Ribbe ◽  
Matthew Wheeler

The annual Australian monsoon pattern includes an onset, or the much anticipated first active monsoon period of the season, but defining the monsoon onset has proven to be problematic. Since the first Australian monsoon onset definition by Troup in 1961 there have been many others presented. There appears to be no universally accepted method to define the Australian monsoon onset, and therefore, we present here an analysis of the methods that have been proposed. The aim of this paper is to systematically review the different methods used to define the Australian monsoon onset, adding to the work that has been done by other reviews for monsoon systems around the world. For the first time, we identify the 25 different methods that have been published for the Australian monsoon/wet season onset and compare them to identify how well they align. When considering the 57 seasons where more than one onset definition is provided, the range of dates within the season can range over several months, with an average range of 44 days and the largest range within a season of 78 days. Thus, we show that different onset definitions are capturing different events altogether and pin the ‘onset’ to different dates throughout the progression of the north Australian wet season. Some capture a ‘wet season onset’ while others capture the dynamical overturning of the atmosphere (i.e. the monsoon). In conclusion, our analysis finds that there is still a lack in real-time monitoring or prognostic capabilities of monsoon onset dates as well as limited operational applicability despite a plethora of definitions.

Author(s):  
Mike Searle

The Tibetan Plateau is by far the largest region of high elevation, averaging just above 5,000 metres above sea level, and the thickest crust, between 70 and 90 kilometres thick, anywhere in the world. This huge plateau region is very flat—lying in the internally drained parts of the Chang Tang in north and central Tibet, but in parts of the externally drained eastern Tibet, three or four mountain ranges larger and higher than the Alps rise above the frozen plateau. Some of the world’s largest and longest mountain ranges border the plateau, the ‘flaming mountains’ of the Tien Shan along the north-west, the Kun Lun along the north, the Longmen Shan in the east, and of course the mighty Himalaya forming the southern border of the plateau. The great trans-Himalayan mountain ranges of the Pamir and Karakoram are geologically part of the Asian plate and western Tibet but, as we have noted before, unlike Tibet, these ranges have incredibly high relief with 7- and 8-kilometre-high mountains and deeply eroded rivers and glacial valleys. The western part of the Tibetan Plateau is the highest, driest, and wildest area of Tibet. Here there is almost no rainfall and rivers that carry run-off from the bordering mountain ranges simply evaporate into saltpans or disappear underground. Rivers draining the Kun Lun flow north into the Takla Makan Desert, forming seasonal marshlands in the wet season and a dusty desert when the rivers run dry. The discovery of fossil tropical leaves, palm tree trunks, and even bones from miniature Miocene horses suggest that the climate may have been wetter in the past, but this is also dependent on the rise of the plateau. Exactly when Tibet rose to its present elevation is a matter of great debate. Nowadays the Indian Ocean monsoon winds sweep moisture-laden air over the Indian sub-continent during the summer months (late June–September). All the moisture is dumped as the summer monsoon, the torrential rains that sweep across India from south-east to north-west.


2007 ◽  
Author(s):  
Ashis Kumar Gohain ◽  
Nayef Abdullah Al-Anzi ◽  
Ekpo Ita Archibong ◽  
Waleed Ahmed Jawad
Keyword(s):  

2008 ◽  
Vol 27 (2) ◽  
pp. 164-187 ◽  
Author(s):  
Torben Wolff

The Danish Ingolf Expedition took place in the summer months of 1895 and 1896, with C. F. Wandel as captain, a man with long experience in hydrographical work in the Arctic. The other scientific participants were the zoologists H. Jungersen, W. Lundbeck and H. J. Hansen during the 1895 cruise; C. Wesenberg-Lund replaced Hansen during the 1896 cruise. C. H. Ostenfeld was the botanist and M. Knudsen the hydrographer. The Ingolf (see Figure 1) was a naval cruiser. In both years the voyages were hindered by ice that had moved much further south than normal, even closing most of the Denmark Strait. In 1895, the best results were obtained south of Iceland and in the Davis Strait; in 1896 south and east of Iceland and as far north as Jan Mayen Island. A total of 144 stations were completed, all with soundings, trawlings and (for the first time) continuous hydrographical work associated with the deep-sea trawling (bottom measurements of temperature, salinity, chlorine contents and specific gravity). Eighty of the stations were deeper than 1,000 m. There were more than 800 hydrographical measurements, with about 3,300 registrations recordings added on the basis of the measurements. 138 gas analyses were performed on board with samples from the surface and the sea bottom. The main result of the expedition was the final demonstration of probably the most important threshold boundaries in the world: the Wyville Thompson Ridge from East Greenland to Scotland with maximum depths of 600 m, separating the fauna in the Norwegian and Polar Sea to the north, always with negative below-zero temperatures except close to the Norwegian coast, from the fundamentally different general Atlantic deep-sea fauna to the south of the ridge with positive temperatures. The results are published in the Ingolf Report, with fifteen volumes containing forty-three papers by nineteen Danish authors and fourteen papers by six foreign authors. The sieving technique was excellent—due to an apparatus designed by H. J. Hansen that kept the animals under water until preservation and using the finest silk for sieving. In this way, the expedition collected more smaller animals than had been acquired by previous deep-sea expeditions. Hansen's studies of the peracarid crustaceans and parasitic copepods and Lundbeck's report on the sponges were particularly noteworthy. The 130 photographs taken on board and on land by the ship's doctor William Thulstrup represent a cultural/historical treasure.


2009 ◽  
Vol 9 (19) ◽  
pp. 7419-7429 ◽  
Author(s):  
L. Labrador ◽  
G. Vaughan ◽  
W. Heyes ◽  
D. Waddicor ◽  
A. Volz-Thomas ◽  
...  

Abstract. Measurements of nitrogen oxides onboard a high altitude aircraft were carried out for the first time during the Northern Australian monsoon in the framework of the Aerosol and Chemical Transport in Tropical Convection (ACTIVE) campaign, in the area around Darwin, Australia. During one flight on 22 January 2006, average NOx volume mixing ratios (vmr) of 984 and 723 parts per trillion (ppt) were recorded for both in and out of cloud conditions, respectively. The in-cloud measurements were made in the convective outflow region of a storm 56 km south-west of Darwin, whereas those out of cloud were made due south of Darwin and upwind from the storm sampled. This storm produced a total of only 8 lightning strokes, as detected by an in-situ lightning detection network, ruling out significant lightning-NOx production. 5-day backward trajectories suggest that the sampled airmasses had travelled over convectively-active land in Northern Australia during that period. The low stroke count of the sampled storm, along with the high out-of-cloud NOx concentration, suggest that, in the absence of other major NOx sources during the monsoon season, a combination of processes including regional transport patterns, convective vertical transport and entrainment may lead to accumulation of lightning-produced NOx, a situation that contrasts with the pre-monsoon period in Northern Australia, where the high NOx values occur mainly in or in the vicinity of storms. These high NOx concentrations may help start ozone photochemistry and OH radical production in an otherwise NOx-limited environment.


2020 ◽  
pp. 237-250
Author(s):  
I. S. Urmancheeva ◽  

The paper presents a comparative analysis of the phraseological units of dialects of the Local Pechora and the all-Russian phraseological units of identical semantics (with a form variation) or an identical form (with a semantics variation). The Russian dialects of Local Pechora are a speech of aboriginals of the Ust-Tsilemsky Region of the Komi Republic of the Russian Federation. A complex description covers a big group of the Pechora phraseological units corresponding to the all-Russian phraseological units that are the research objects. The art features of dialect phraseological units are considered. Also, the analysis is made of the figura-tive basis reflecting a picture of the world of the inhabitant of the North. The relevance and scientific novelty of work is due to the fact that it is for the first time that this phraseological material is subjected to such a complex investigation. The main source of the study was the “Phraseological dictionary of the Russian dialects of the Lower Pechora”, with additional ma-terial taken from the “Dictionary of Russian dialects of the Komi Republic” and other dialect dictionaries. All-Russian phraseological units were taken from Russian phraseological dic-tionaries. The paper provides a broad view of the phraseological structure of the Russian lan-guage. The research has revealed phonetic, word-formative, morphological, syntactic, lexical, structural, quantitative and semantic dialectal variants of all-Russian phraseological units, as well as the phenomena of combined (mixed) variation. The comparative analysis allowed re-vealing the originality of the Pechora phraseological units that have preserved many archaic phenomena due to the long, isolated existence of a dialect in the conditions of interlingual contacts.


Author(s):  
Vanessa LoBue

9 Months In, 9 Months Out is a month-to-month real-time account of pregnancy and first-time parenthood that integrates the science of infant and child development with the personal journey involved in becoming a parent. Expertise can explain the science of what’s happening to a fetus or a baby throughout development, but all the science in the world can’t tell you what it feels like to have a baby: the pang of morning sickness, the pain of labor, the excitement of birth, and the joy that comes from seeing your baby’s first smile. This book is about pregnancy and first-time parenthood and what we experience in the 9 months of pregnancy and the 9 months that follow. As a professor of infant and child development, the author had certain expectations about how pregnancy and motherhood would go. Experiencing it was a totally different story. As she learned, the first few months of parenthood are much harder than anyone tells you. As she describes her personal journey through first-time parenthood, the author also takes a researcher’s lens to issues that are top of mind for new parents: breastfeeding, the sleep training controversy, gender development, the science (or lack thereof) behind the link between vaccinations and autism, the debate over screen time, and many more.


Author(s):  
Alejandro Muñoz-López ◽  
Fabiano de Souza Fonseca ◽  
Rodrigo Ramírez-Campillo ◽  
Petrus Gantois ◽  
Francisco Javier Nuñez ◽  
...  

2019 ◽  
pp. 49-68
Author(s):  
Jana Riess

This chapter looks at Mormons' experiences in the Latter-day Saints (LDS) temple. Whereas regular Sunday services are open to the public at thousands of LDS chapel meetinghouses around the world, temples are rare—there are just over 150 around the globe—and closed to everyone but the most committed Latter-day Saints. The Next Mormons Survey (NMS) data shows that most Mormons who have been to the temple do have a good first experience. Six in ten current Mormon respondents reported that they had been to the temple for the initiatory followed by the endowment ceremony, which are the two essential rites of initiation for the LDS temple. However, it is possible there is a disconnect between what millennials say about loving their first time in the temple and what some of them actually felt in real time. Overall, the temple emerges as a complex site of contention for many former Mormons.


1972 ◽  
Vol 6 (4) ◽  
pp. 393-404 ◽  
Author(s):  
João Yunes

In 1970 the population of Brazil with 94,508,554 inhabitants was extreme youth, since 42.67% was composed of children under 14 years old. In that year the proportion of female was 50.2%. The population density increased from 1.17 inhabitants /km² in 1872 to 11.18 in 1970, and in this last year the range was 1.03 in the North region and 43.90 in the South-East region. The urban population increased from 31.24% in 1940 to 55.98% in 1970 and for the first time the rural population was smaller than the urban population. In 1950 concerning with marital status 39% of the population 15 years old and over was single and 54% married. In 1970 this rate was respectively 35.4% and 56.6%. The population economically inactive increased from 49.17% in 1940 to 52.24% in 1970. The literacy ratio increased from 43% in 1940, to 48% in 1950 and 68.04% in 1970. The crude birth rate was 43/1000 live births in 1950 and fell to 37.7/1000 in 1970. The fertility rate decreased from 179.3/1000 women (15-49 years old} to 156.7/1000 in 1960/70. The crude death rate decreased from 20.60/1000 inhabitants in 1940/50 to 9.4/1000 in 1960/70. The infant mortality rate still remains high: 171/1000 live births in 1940/50 and 170/1000 in 1971. Concerning with the size of the cities, 8 in 1940 had 100,000 or more inhabitants and in 1970 this number increased to 94 cities. The population growth increased from 2.38% in 1940/50, to 2.99% in 1950/60 and 2.83% in 1960./70. Brazil is the first country in population size in Latin America and the eighth in the world. Concerning his area, Brazil is the fifth country in size.


1966 ◽  
Vol 98 (4) ◽  
pp. 337-393 ◽  
Author(s):  
H. Rodney Dodge

AbstractFirst instars of 93 North American species of mosquitoes are studied and 56 are illustrated, 41 for the first time. Generic differences are well marked in this instar and nearly all species are separable.Two keys to the 11 North American genera are presented; the first is constructed to show similarities between first and later instars. Each genus is described and keyed to species, and notes are given on each species. A supplementary key to the species of the southeastern states is designed for the use of a binocular microscope with magnification up to 60 ×.Specific and generic differences are as well marked in the first as in the fourth instar. Identifications are as easy or as difficult in the first as in the fourth instar, though usually based on different characters.An expanded key to the North American species of Aedes, incorporating those previously treated by Bohart and by Price, is attempted. The key reveals several species complexes which have not been discerned from other stages of the life cycle, namely, Aedes canadensis, nigromaculis, punctor, stimulans infirmatus and trivittatus.A key to the first instars of the 37 species of the world-wide Anophelinae is presented, on the basis of published descriptions and figures of the exotic species.


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