Junger hisṭoriker : šrifṭn fun seminar far jidišer gešichṭe ba der jidišer akademišer haim in Warše

[redaktzie kolegie: Rafael Mahler ... ]

Freshening of the Alaska Coastal Current Recorded By Coralline Algal Ba/Ca Ratios

Arctic Ocean freshening can exert a controlling influence on global climate, triggering strong feedbacks on ocean-atmospheric processes and affecting the global cycling of the world's oceans. Glacier-fed ocean currents such as the Alaska Coastal Current are important sources of freshwater for the Bering Sea shelf, and may also influence the Arctic Ocean freshwater budget. Instrumental data indicate a multiyear freshening episode of the Alaska Coastal Current in the early 21st century. It is uncertain whether this freshening is part of natural multidecadal climate variability or a unique feature of anthropogenically induced warming. In order to answer this, a better understanding of past variations in the Alaska Coastal Current is needed. However, continuous long-term high-resolution observations of the Alaska Coastal Current have only been available for the last 2 decades. In this study, specimens of the long-lived crustose coralline alga Clathromorphum nereostratum were collected within the pathway of the Alaska Coastal Current and utilized as archives of past temperature and salinity. Results indicate that coralline algal Mg/Ca ratios provide a 60 year record of sea surface temperatures and track changes of the Pacific Decadal Oscillation, a pattern of decadal-to-multidecadal ocean-atmosphere climate variability centered over the North Pacific. Algal Ba/Ca ratios (used as indicators of coastal freshwater runoff) are inversely correlated to instrumentally measured Alaska Coastal Current salinity and record the period of freshening from 2001 to 2006. Similar multiyear freshening events are not evident in the earlier portion of the 60 year Ba/Ca record. This suggests that the 21st century freshening of the Alaska Coastal Current is a unique feature related to increasing glacial melt and precipitation on mainland Alaska.

Die hebräische Präposition ba'ad

Heinrich Graetz

Mišnāyôt Sēder qōdāšîm : ʿim pêrûš Melô qaf naḥat melûqqaṭ miš-šenê me'ôrôt hag-gedôlîm ... ʿÔvady' mib-Berṭinôrô we- ... hag-gā'ôn Baʿal Tôsāfôt Yôm Ṭôv ; Bd. 5

Mit handschriftlichen Anmerkungen

Sefer Beʾer shevaʿ : ve-hu ḥibur tosafot ʿal kol ha-meḳomot ba-Gemara she-lo nimtsa bahem Tosafot ha-lo hemah shete masekhtot shelemot u-peraḳim harbeh ṿe-ḥidushim be-harbeh hilkhot amuḳot be-masekhet Soṭah u-ve-masekhet Ḥulin ... u-sheʾelot u-teshuvot

ḥibero Yiśśakhar bar Yisrael Lezer Parnas ...

Sefer refuʾat ha-nefesh : kolel kol baḳashot ha-ḥoleh ṿe-ha-mevaḳrim ... ṿe-khol dine ṿe-hanhagat toharat ha-metim ... ṿe-nosaf bo kol dine aninut ...

Zanṿil Hanover

Sefer Ḳohelet Shelomoh : bo niḳhalu kamah devarim ṭovim mi-sefarim yeshanim ṿa-ḥadashim, lelamed le-khol adam laʿasoḳ ba-Torah u-va-ʿavodah ... und damiṭ oykh daz froyentsimmer di pflikhṭen ḳenne, di zi gegen Goṭṭ, gegen ihren mann, gegen di ṿelṭ und gegen zikh zelbsṭ tsu beobakhṭen haṭ, izṭ alles in rayner dayṭsher shprakhe tsum driṭṭen male umgearbayṭeṭ und neben dem hebräishen angebrakht

durkhoys alles feränderṭ, ferbesserṭ und zehr fermehrṭ ʿal yede Shelomoh ben Efrayim Blokh ...

Der "Yeshivah baḥur" : (oder der yudisher Hamleṭ) ; a piese in 4 aḳṭen un 6 bilder

fun Zloṭoroṿsḳi

Rb-Sr isotope systematics and Sr/Ca-Ba/Ca ratios at DSDP Hole 89-462A

Four samples of Nauru Basin basalts (Cores 94 to 109 of Hole 462A, sub-bottom depth 1077-1209 m) have 87Sr/86Sr ratios in the range 0.7037 to 0.7038, which is distinctly higher than the ratios of N-type MORB. The Rb contents of the samples are depleted in comparison with those of MORB and ocean-island basalts. These chemical and isotopic characteristics are identical to those of the basalts previously drilled during Leg 61 (Cores 75 to 90 of Hole 462A), and are explained in terms of inhomogeneity of the source region in the mantle or later alteration effects. Sr/Ca-Ba/Ca systematics of 15 samples from Cores 462A-94 to 462A-109 and 14 samples from Cores 462A-75 to 462A-90 suggest that the Nauru Basin basalts are derived from a mantle peridotite by 20 to 30% partial melting with subsequent Plagioclase crystallization.

Ba/Ca ratios in Neogloboquadrina pachyderma of sedimet core 94B17

Down-core samples of the planktonic foraminifer Neogloboquadrina pachyderma sinistral from the Mendeleyev Ridge in the western Arctic Ocean have been analyzed for Ba/Ca and d18O. The apparent distribution coefficient for N. pachyderma sin. is estimated at DBa = 0.22 ± 0.02. A meltwater event is identified at around 11.8 14C kyr BP and is coincident with elevated Ba/Ca ratios. The barium enrichment is believed to be the result of enhanced weathering and erosion following glaciation. Additionally, barium may have desorbed from shelf sediments as sea level rose. Changes in Ba/Ca correlate with the retreat of the Laurentide Ice Sheet and the evolution of the Mackenzie River drainage basin. Therefore maximum Ba/Ca in Arctic surface waters at 11.8 ka may be indicative of an increase in the export of freshwater from the Arctic to the North Atlantic, potentially contributing to the onset of the Younger Dryas. This work suggests that Ba/Ca in planktonic foraminifera may be a useful indicator of the timing and processes associated with deglaciation.