10,268 research outputs found
On the structural changes in the Brewer-Dobson circulation after 2000
No full textIn this paper we present evidence that the observed increase in tropical upwelling after the year 2000 may be attributed to a change in the Brewer-Dobson circulation pattern. For this purpose, we use the concept of transit times derived from residual circulation trajectories and different in-situ measurements of ozone and nitrous dioxide. Observations from the Canadian midlatitude ozone profile record, probability density functions of in-situ N2O observations and a shift of the N2O-O3 correlation slopes, taken together, indicate that the increased upwelling in the tropics after the year 2000 appears to have triggered an intensification of tracer transport from the tropics into the extratropics in the lower stratosphere below about 500 K. This finding is corroborated by the fact that transit times along the shallow branch of the residual circulation into the LMS have decreased for the same time period (1993–2003). On a longer time scale (1979–2009), the transit time of the shallow residual circulation branch show a steady decrease of about −1 month/decade over the last 30 years, while the transit times of the deep branch remain unchanged. This highlights the fact that a change in the upwelling across the tropical tropopause is not a direct indicator for changes of the whole Brewer-Dobson circulation
Dobson, R P, 403238
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/381984Surname: DOBSON. Given Name(s) or Initials: R P. Military Service Number or Last Known Location: 403238. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 43907.212274
Item: [2016.0049.14277] "Dobson, R P, 403238
Dobson, P, VX16558
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/381995Surname: DOBSON. Given Name(s) or Initials: P. Military Service Number or Last Known Location: VX16558. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 7301.212307
Item: [2016.0049.14288] "Dobson, P, VX16558
Changes in Stratospheric Temperatures and Their Implications for Changes in the Brewer–Dobson Circulation, 1979–2005
No full textSeasonally and vertically resolved changes in the strength of the Brewer–Dobson circulation (BDC) were inferred using temperatures measured by the Microwave Sounding Unit (MSU), Stratospheric Sounding Unit (SSU), and radiosondes. Linear trends in an empirically derived “BDC index” (extratropical minus tropical temperatures), over 1979–2005, were found to be consistent with a significant strengthening of the Northern Hemisphere (NH) branch of the BDC during December throughout the depth of the stratosphere. Trends in the same index suggest a significant strengthening of the Southern Hemisphere branch of the BDC during August through to the midstratosphere, as well as a significant weakening during March in the NH lower stratosphere. Such trends, however, are only significant if it is assumed that interannual variability due to the BDC can be removed by regression of the tropics against the extratropics and vice versa (i.e., exploiting the out-of-phase nature of tropical and extratropical temperatures as demonstrated by previous studies of temperature and the BDC). The possibility that the apparent lower-stratosphere BDC December strengthening and March weakening could point to a change in the seasonal cycle of the circulation is also explored. The differences between a 1979–91 average and 1995–2005 average tropical temperature seasonal cycle in lower-stratospheric MSU data show an apparent shift in the minimum from February to January, consistent with a change in the timing of the maximum wave driving. Additionally, the importance of decadal variability in shaping the overall trends is highlighted, in particular for the suggested March BDC weakening, which may now be strengthening from a minimum in the 1990s
Annise-Dobson/Earthworm-Deer-Multiyear: Archive-Deer-Earthworm-Multiyear
No full text<p>Archived data for Manuscript accepted at Journal of Ecology January 2024</p>
Letters on the existence and character of the Deity, and on the moral state of man.
No full textiv, [1], 6-144 p. ; 17 cm. (8vo)Attributed to Thomas Dobson by Evans, who notes "229th Pennsylvania Copyright issued to Thomas Dobson, as author, 23 April, 1799.
Annise-Dobson/Earthworm-Deer-Multiyear: Accepted Journal of Ecology January 2024
No full text<p>FIxed data path</p>
Open access monograph case study - Hugo Dobson
No full textCase study from Professor Hugo Dobson, School of East Asian Studies, University of Sheffield, about the experience of publishing an open access monograph.Compiled by Indigo Gray and Itzel San Roman Pineda for the University of Sheffield Library (Spring 2024).</p
Changes of partitioning and increased root lengths of spruce and beech exposed to ambient pollution concentrations in southern England
No full text- …
