Sensitivity of Red Sea circulation to sea level and insolation forcing during the last interglacial

Trommer, Gabriele; Siccha, Michael; Rohling, Eelco J.; Grant, Katharine; Meer, Marcel T. J. van der; Schouten, Stefan; Baranowski, Ulrike; Kučera, Michal

doi:10.5194/cp-7-941-2011

Cited by 18 publications

(6 citation statements)

References 103 publications

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“…A large proportion of our spectroradiometer profiles did not reach below the mixed layer, while for those that went beneath it, we did not notice an obvious change in K d at the boundary between the two layers, suggesting no marked change in the concentration of CDOM from 5 m to ~40 m (our maximum sampling depth), possibly due to the absence of high amounts of source material. Large quantities of CDOM are usually transported from land into coastal waters by rivers , however, the Red Sea lacks riverine inputs , contributing toward its high transparency. Our finding that a CDOM and UV attenuation were strongest at the stations around the Farasan Islands could be due to CDOM sources from coastal marine vegetation, such as mangroves and seagrasses , which are abundant in this area characterized by islands, shallow sandbanks and reefs .…”

Section: Discussionmentioning

confidence: 99%

Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin

Overmans

Agustı́

2019

Photochem & Photobiology

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The tropical and subtropical oceans experience intense incident ultraviolet radiation (280–400 nm) while their water columns are thought to be highly transparent. This combination represents a high potential for harmful effects on organisms, yet only few reports on the UV penetration properties of oligotrophic tropical waters exist. Here, we present the pattern of UV attenuation over a wide latitudinal range of the oligotrophic Red Sea. We recorded spectroradiometer profiles of PAR and UV, together with chlorophyll‐a (Chl‐a) and light absorption by chromophoric dissolved organic matter (CDOM) to determine the contribution of phytoplankton and CDOM toward UV attenuation. Transparency to UV exhibited a distinct latitudinal gradient, with the lowest and highest diffuse attenuation coefficients at 313 nm (K d (313)) of 0.130 m−1 and 0.357 m−1 observed at the northern coast off Duba, and in the south close to the Farasan islands, respectively. Phytoplankton and CDOM both modulated UV attenuation, but CDOM was found to be the key driver despite the lack of riverine inputs. We confirm that ultraviolet radiation can reach deeper into the Red Sea than previously described, which means its potential to act as a stressor and selective driver for Red Sea organisms may have been underestimated to date.

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Section: Discussionmentioning

confidence: 99%

Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin

Overmans

Agustı́

2019

Photochem & Photobiology

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“…GDGTs are also found in soils and can be transported to ocean basins by rivers, potentially affecting the TEX 86 proxy for sites near river outflow [ Weijers et al , 2006]. Enclosed settings may show calibration lines that are offset from open ocean calibration lines, which suggests that different source populations may exist [ Trommer et al , 2009, 2011]. To improve SST estimates and to reduce the impact of secondary effects on temperature signals, it is desirable to use multiple proxies whenever possible [ Liu et al , 2009].…”

Section: Proxy Recordsmentioning

confidence: 99%

Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years

Gasson¹,

Siddall²,

Lunt³

et al. 2012

Reviews of Geophysics

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[1] Over the past decade, efforts to estimate temperature and sea level for the past 50 Ma have increased. In parallel, efforts to model ice sheet changes during this period have been ongoing. We review published paleodata and modeling work to provide insights into how sea level responds to changing temperature through changes in ice volume and thermal expansion. To date, the temperature to sea level relationship has been explored for the transition from glacial to interglacial states. Attempts to synthesize the temperature to sea level relationship in deeper time, when temperatures were significantly warmer than present, have been tentative. We first review the existing temperature and sea level data and model simulations, with a discussion of uncertainty in each of these approaches. We then synthesize the sea level and temperature data and modeling results we have reviewed to test plausible forms for the sea level versus temperature relationship. On this very long timescale there are no globally representative temperature proxies, and so we investigate this relationship using deep-sea temperature records and surface temperature records from high and low latitudes. It is difficult to distinguish between the different plausible forms of the temperature to sea level relationship given the wide errors associated with the proxy estimates. We argue that for surface high-latitude Southern Hemisphere temperature and deep-sea temperature, the rate of change of sea level to temperature has not remained constant, i.e., linear, over the past 50 Ma, although the relationship remains ambiguous for the available low-latitude surface temperature data. A nonlinear form between temperature and sea level is consistent with ice sheet modeling studies. This relationship can be attributed to (1) the different glacial thresholds for Southern Hemisphere glaciation compared to Northern Hemisphere glaciation and (2) the ice sheet carrying capacity of the Antarctic continent.

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“…Many investigations in and adjacent to the Red Sea have focused on reconstructing these events over the Holocene. Most of these studies have been performed on deep sediment records (Arz et al, 2003(Arz et al, , 2006Biton et al, 2008;Rohling et al, 2008;Edelman-Furstenberg et al, 2009;Trommer et al, 2010Trommer et al, , 2011. However, numerous studies have been carried out along the Red Sea coast (Moustafa et al, 2000;Hein et al, 2011;Bantan, 2013, 2015;Basaham et al, 2014;Ghandour et al, 2016;Al-Zubieri et al, 2017;Nabhan and Yang, 2018;Pavlopoulos et al, 2018;Bantan et al, 2019Bantan et al, , 2020.…”

Section: Introductionmentioning

confidence: 99%

Mid-Late Holocene Paleoenvironmental and Sea Level Reconstruction on the Al Lith Red Sea Coast, Saudi Arabia

et al. 2021

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Late Quaternary paleoenvironments are of particular interest to understand how the Earth System’s climate will respond to the undramatic changes during this period, compared with the broader glacial-interglacial variations. In this study, a shallow sediment core (2.84 m long) retrieved from the Red Sea coastal zone in northern Ghubbat al Mahasin, south of Al-Lith, Saudi Arabia, is used to reconstruct the mid-Late Holocene paleoenvironments and sea level based on a multiproxy approach. Remote sensing data, sedimentary facies, benthic foraminiferal assemblages, δ18O and δ13C stable isotopes, elemental composition and 14C dating were utilized. The stratigraphy of the core shows three distinctive depositional units. The basal pre 6000 year BP unit consists of unfossiliferous fine to medium sand sharply overlain by black carbonaceous mud and peat, suggesting deposition in a coastal/flood plain under a warm and humid climate. The middle unit (6000-3700 year BP) records the start and end of the marine transgression in this area. It consists of gray argillaceous sand containing bivalve and gastropod shell fragments and a benthic foraminiferal assemblage attesting a lagoonal or quiet shallow marine environment. The upper unit (<3700 year BP) consists of unfossiliferous yellowish-brown argillaceous fine-grained sands deposited on an intertidal flat. Both middle-and upper-units stack in a regressive shallowing upward pattern although they may be separated by a hiatus. The overall regressive facies and the stable isotopic data are consistent with a late Holocene sea-level fall and a change to a more arid climate.

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Sensitivity of Red Sea circulation to sea level and insolation forcing during the last interglacial

Cited by 18 publications

References 103 publications

Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin

Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin

Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years

Mid-Late Holocene Paleoenvironmental and Sea Level Reconstruction on the Al Lith Red Sea Coast, Saudi Arabia

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