Deep-Sea Res thirty two: 57-84
Abstract: Stable isotopes have been widely used in the literature both to discuss current ocean circulation processes, as well as to reconstitute paleoceanographic parameters. The distribution of oxygen and deuterium stable isotopes in seawater (? 18 Osw and ?Dsw) at the Western Tropical South Atlantic border was investigated to better understand the main fractionation processes of these isotopes and establish a regional salinity and ? 18 Osw relation to improve the paleoceanographic knowledge in the region. This study was conducted during a quasi-synoptic oceanographic cruise in which 98 discrete seawater samples were collected in the core of the main water masses for stable isotope analysis. A strong correlation between ? 18 Osw and ?D was found, which made it possible to extrapolate the results for ? 18 Osw to ?D. Although it was not possible to distinguish the water masses based only on their isotopic signatures, the water masses had a strong salinity and ? 18 Osw relation, and compared with previous studies, a seasonal pattern was observed. Paleosalinity differences of up to 0.2 psu between Summer and Winter are reported. Considering the limitations of the current techniques to seasonally ples for the paleoceanographic studies, an intermediate Mixing Line for the Tropical South Atlantic (SSS = 1.942* ? 18 Osw + ) was proposed to reduce the estimated errors associated with these seasonal variations.
The new isotopic fractionation off both outdoors and you can deuterium inside the seawater (? 18 O The aid of these types of steady isotopes along with thermohaline research was in fact widely used into the paleoceanographic reconstructions considering additional matrices ( Holloway HOLLOWAY MD, SIME LC, SINAGARAYER JS, TINDALL JC and you will VALDES PJ. Rebuilding paleosalinity out of ?18O: Combined design simulations of one’s Past Glacial Restrict, History Interglacial and you will Later Holocene. Quatern Sci Rev 131: 350-364. J Geophys Res 84: 5029-5033. Late Pleistocene-Holocene paleoproductivity stream from the The japanese Sea: sea-top control to the ?13C and you may ?15N ideas of sediment natural issue. Palaeogeogr Palaeoclimatol Palaeoecol 135(1-4): 41-50. Advanced and deep-water paleoceanography of northern Northern Atlantic over for the past 21,100000 many years. Paleoceanogr 25: PA1211.
Salinity alterations in the https://datingranking.net/es/sparky-review/ newest west warm Southern area Atlantic over the past 31 kyr. Worldwide Globe Transform 57: 383-395. Brand new delivery from sea frost meltwater on eastern Canadian Arctic. J Geophys Res Oceans (1978–2012) 85(C4): 1925-1932. Another significant applying of ? 18 O Fresh air isotopes, upper-ocean salinity, and you may precipitation sources. Earth World Sc Lett 224: 493-507. Deuterium and you will oxygen-18 variations in the ocean together with aquatic ambiance. In: Tongiorgi Age (Ed), Stable Isotopes into the Oceanographic Training and you can Paleotemperatures. Spoleto, Italy, p. The brand new delivery out of 13C throughout the Atlantic Water. World World Sc Lett 49: 469-484. The newest delivery out-of 13C from ?CO: all over the world oceans. The brand new clean air and you may carbon dioxide isotope delivery on Mediterranean drinking water public.
Aquatic Geol 153: 41-55. Outdoors and you will carbon steady isotope tracers of your own liquids public from inside the the latest Main Brazil Basin. Deep-Water Res 38(5): 597-606. Influence out of continental shelf procedure within the water size harmony and you can productivity away from secure isotope study to your Southeastern Brazilian coast. J Marine Syst 139: 241-247. Also temperatures and salinity, the fresh secure isotope attributes is actually printed in the water masses based on their formation part. Whilst ? 18 O
Limitations to your salinity–oxygen isotope matchmaking throughout the central warm Pacific Ocean
General sea stream is actually driven by occurrence distinctions, which often are determined through the equation away from county from temperature, salinity and you can stress data. Current gadgets advancements help to level these types of details that have a high standard of precision and you will accuracy. But not, to reconstruct this type of parameters towards early in the day, towards paleoceanographic knowledge, the utilization of proxies is needed. Upcoming, the secure isotopic composition away from frost cores, carbonates and you will all-natural topic has proven become powerful proxies to own paleoclimatic reconstructions ( Gat GAT JR. 1996. Fresh air and you will hydrogen isotopes regarding hydrologic course. Annu Rev Planet World Sci twenty four: 225-262. 1996). To possess paleotemperature reconstructions, you can find techniques and you can proxies which might be already centered, eg microfossil assemblage-built transfer services and Milligrams/California percentages out of foraminifera examination otherwise Sr/Ca for red coral ( Elderfield ELDERFIELD H and you may GANSSEN G. 2000. Earlier in the day temperatures and you can delta O-18 out of epidermis water oceans inferred regarding foraminiferal Milligrams/California percentages. Character 405(6785): 442-445. and you can Ganssen 2000, Nurhati NURHATI Try, COBB Kilometer and DI LORENZO E. 2011. Decadal-level SST and you will salinity differences in the fresh main exotic Pacific: signatures of pure and you may anthropogenic climate alter. J Clim twenty four (13): 3294-3308. ainsi que al. 2011, Rohling ROHLING EJ. 2007. Advances during the paleosalinity: Analysis and you may demonstration of a different approach. Paleoceanogr twenty-two(3). DOI: PA001437. 2007). But not, proxies to own salinity will always be during the creativity, particularly to attenuate what causes uncertainty (which will be doing 4 psu) due to changes in regional freshwater costs, water flow and you may water frost regimes (Holloway mais aussi al. 2015, Schmidt SCHMIDT GA. 1999. Mistake analysis out of paleosalinity reconstructions. Paleoceanogr fourteen(3): 422-429. 1999).
