Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Grauel, Anna‐Lena; Bernasconi, Stefano M.

doi:10.1016/j.marmicro.2010.09.003

Cited by 26 publications

(23 citation statements)

References 39 publications

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“…A constant concentration boundary condition was used for coastal cells. The constant concentration (salinity) was assumed equal to 38,000 and 39,500 mg/L along the Adriatic Sea and Ionian Sea, respectively (Janekovic et al 2006;Grauel and Nernasconi 2010). The 3D spatial distribution of groundwater salinity was calculated (Fig.…”

Section: Past Scenariosmentioning

confidence: 99%

Modelling and management of a Mediterranean karstic coastal aquifer under the effects of seawater intrusion and climate change

2015

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The study and management of the groundwater resources of a large, deep, coastal, karstic aquifer represent a very complex hydrogeological problem. Here, this problem is successfully approached by using an equivalent porous continuous medium (EPCM) to represent a karstic Apulian aquifer (southern Italy). This aquifer, which is located on a peninsula and extends to hundreds of metres depth, is the sole local source of high-quality water resources. These resources are at risk due to overexploitation, climate change and seawater intrusion. The model was based on MODFLOW and SEAWAT codes. Piezometric and salinity variations from 1930 to 2060 were simulated under three past scenarios (up to 1999) and three future scenarios that consider climate change, different types of discharge, and changes in sea level and salinity. The model was validated using surveyed piezometric and salinity data. An evident piezometric drop was confirmed for the past period (until 1999); a similar dramatic drop appears to be likely in the future. The lateral intrusion and upconing effects of seawater intrusion were non-negligible in the past and will be considerable in the future. All phenomena considered here, including sea level and sea salinity, showed non-negligible effects on coastal groundwater.

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Section: Past Scenariosmentioning

confidence: 99%

Modelling and management of a Mediterranean karstic coastal aquifer under the effects of seawater intrusion and climate change

2015

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“…To avoid variations in δ 18 O and δ 13 C caused by different morphotypes of G. ruber (white), we selected only the morphotype platys according to the nomenclature of Numberger et al (2009). After picking, foraminiferal tests were cleaned according to the protocol described by Grauel and Bernasconi (2010), in order to eliminate carbonate particles adhering to the shell surface. For isotope analyses, about 150-200 μg of cleaned shell material was dissolved under vacuum with two drops of~103% H 3 PO 4 at 70°C cleaned cryogenically using a Thermo Fisher Kiel IV preparation device coupled to a Thermo Fisher MAT 253 mass spectrometer.…”

Section: δ 18 O and δ 13 C Downcore Analysis Of G Ruber (White)mentioning

confidence: 99%

Seasonality variations in the Central Mediterranean during climate change events in the Late Holocene

Goudeau

Reichart

Wit

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The oligotrophic state of the Mediterranean Sea after the phase of the sapropel S1, and the absence of correspondence between temporal δ 13 C changes and the global rise of atmospheric CO 2 , allow us to relate lower G. bulloides δ 13 C values to the increasing input via the Po and/or coastal Italian, Apennine and Albanian rivers of remineralized continental organic matter presenting depleted δ 13 C values. In this regard, a recent survey of the carbon isotope composition of the planktonic foraminifera along the southern Italian coast of the Adriatic Sea pointed out a strong relationship between lower δ 13 C values and the increasing influence of less saline waters originated from the input of the Po River (Grauel and Bernasconi, 2010).…”

Section: Holocene Hydrological Changes In the Sasmentioning

confidence: 99%

Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea

et al. 2013

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Abstract. Holocene paleohydrology reconstruction is derived combining planktonic and benthic stable oxygen and carbon isotopes, sea surface temperatures (SSTs) and oxygen isotope composition of seawater (δ18Ow) from a high sedimentation core collected in the South Adriatic Sea (SAS). Core chronology is based on 10 AMS 14C measures on planktonic foraminifera and tephra layers. Results reveal two contrasted paleohydrological periods that reflect (i) a marked lowering of δ18Ow/salinity during the early to mid-Holocene (11.5 ka to 6.3 ka), including the two-step sapropel S1 deposition, followed during the mid- to upper Holocene by (ii) a prevailing period of increased salinity and enhanced arid conditions in the South Adriatic Basin. Superimposed on these trends, short-term centennial-scale hydrological events punctuated the Holocene period in the SAS. During the early to mid-Holocene, two main SST coolings together with prominent δ18Ow/salinity lowering delineate the sapropel S1 interruption and the post-sapropel phase between 7.3 to 6.3 ka. After 6 ka, centennial-scale δ18Ow and G. bulloides δ13C lowering, mostly centered between 3 to 0.6 ka, reflect short-term hydrological changes related to more intensive runoff of the Po and/or Apennine rivers. These short-term events, even of lesser amplitude compared to the early to mid-Holocene period, may have induced a lowering of sea surface density and consequently reduced and/or inhibited the formation of deep bottom waters in the SAS. Comparison of the emerging centennial- to millennial-scale hydrological record with previous climatic records from the central Mediterranean area and north of the Alps reveal possible synchronicities (within the radiocarbon-dating uncertainty) between phases of lower salinity in the SAS and periods of wetter climatic conditions around the north-central Adriatic Sea. Finally, wavelet analyses provide new clues about the potential origin of climate variability in the SAS, confirming the evidence for a mid-Holocene transition in the central Mediterranean climate and the dominance of a ~1670-yr periodicity after 6 ka, reflecting a plausible connection with the North Atlantic climate system.

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Core-top calibration of δ18O and δ13C of G. ruber (white) and U. mediterranea along the southern Adriatic coast of Italy

Cited by 26 publications

References 39 publications

Modelling and management of a Mediterranean karstic coastal aquifer under the effects of seawater intrusion and climate change

Modelling and management of a Mediterranean karstic coastal aquifer under the effects of seawater intrusion and climate change

Seasonality variations in the Central Mediterranean during climate change events in the Late Holocene

Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea

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