Middle–Late Cretaceous climate of the southern high latitudes: Stable isotopic evidence for minimal equator-to-pole thermal gradients: Discussion and reply
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Research Article| September 01, 1996 Middle–Late Cretaceous climate of the southern high latitudes: Stable isotopic evidence for minimal equator-to-pole thermal gradients: Discussion and reply G. D. Price; G. D. Price 1Palaeoecology Centre, School of Geosciences, Queen's University of Belfast, Belfast, BT7 1NN, United Kingdom Search for other works by this author on: GSW Google Scholar B. W. Sellwood; B. W. Sellwood 2Postgraduate Research Institute for Sedimentology, University of Reading, P.O. Box 227, Whiteknights, Reading, RG6 2AB, United Kingdom Search for other works by this author on: GSW Google Scholar D. Pirrie D. Pirrie 3Camborne School of Mines, University of Exeter, Redruth, Cornwall, TR15 3SE, United Kingdom Search for other works by this author on: GSW Google Scholar Author and Article Information G. D. Price 1Palaeoecology Centre, School of Geosciences, Queen's University of Belfast, Belfast, BT7 1NN, United Kingdom B. W. Sellwood 2Postgraduate Research Institute for Sedimentology, University of Reading, P.O. Box 227, Whiteknights, Reading, RG6 2AB, United Kingdom D. Pirrie 3Camborne School of Mines, University of Exeter, Redruth, Cornwall, TR15 3SE, United Kingdom Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1996) 108 (9): 1192–1196. https://doi.org/10.1130/0016-7606(1996)108<1192:MLCCOT>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. D. Price, B. W. Sellwood, D. Pirrie; Middle–Late Cretaceous climate of the southern high latitudes: Stable isotopic evidence for minimal equator-to-pole thermal gradients: Discussion and reply. GSA Bulletin 1996;; 108 (9): 1192–1196. doi: https://doi.org/10.1130/0016-7606(1996)108<1192:MLCCOT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract No Abstract Available. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.Keywords:
Queen (butterfly)
Kingdom
Time varying magnetic fields can influence the accuracy of aeromagnetic surveys. The effect is more pronounced at lower latitudes. It can be quite small at higher latitudes if the induction vector points towards the equator. In any latitude, east–west variations have little effect.
Aeromagnetic survey
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Abstract. We present the zonal mean temperature variations for the quasi-biennial oscillation (QBO) and the semiannual oscillation (SAO) based on data from SABER on the TIMED spacecraft (years 2002 to 2004) and from MLS on the UARS mission (1992 to 1994). The SABER measurements provide the rare opportunity to analyze data from one instrument over a wide altitude range (15 to 95 km), while MLS data were taken in the 16 to 55 km altitude range a decade earlier. The results are presented for latitudes from 48° S to 48° N. New results are obtained for the QBO, especially in the upper stratosphere and mesosphere, and at mid-latitudes. At Equatorial latitudes, the QBO amplitudes show local peaks, albeit small, that occur at different altitudes. From about 20 to 40 km, and within about 15° of the Equator, the amplitudes can approach 3.5° K for the stratospheric QBO (SQBO). For the mesospheric QBO (MQBO), we find peaks near 70 km, with temperature amplitudes reaching 3.5° K, and near 85 km, the amplitudes approach 2.5° K. Morphologically, the amplitude and phase variations derived from the SABER and MLS measurements are in qualitative agreement. As a function of latitude, the QBO amplitudes tend to peak at the Equator but then increase again pole-ward of about 15° to 20°. The phase progression with altitude varies more gradually at the Equator than at mid-latitudes. Many of the SAO results presented are also new, in part because measurements were not previously available or were more limited in nature. At lower altitudes near 45 km, within about 15° of the Equator, the temperature amplitudes for the stratospheric SAO (SSAO) reveal a local maximum of about 5° K. At higher altitudes close to the Equator, our results show separate peaks of about 7° K near 75 and 90 km for the mesospheric SAO (MSAO). In the SAO results, significant inter-annual differences are evident, with the amplitudes being largest in 2002 relative to 2003 and 2004. As in the case for the QBO, the SAO temperature amplitudes go through minima away from the Equator, and then increase towards mid latitudes, especially at altitudes above 55 km. We compare our findings with previously published empirical results, and with corresponding results from the numerical spectral model (NSM). Although not a focus of this study, we also show results for the inter-annual variations (which appear to be generated at least in part by the QBO) of the migrating diurnal tide. In the upper mesosphere, their amplitudes can approach 20° K, and they are derived jointly with the zonal-mean components.
Quasi-biennial oscillation
Oscillation (cell signaling)
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