Seasonal controls on sediment transport and deposition in Lake Ohau, South Island, New Zealand: implications for a high-resolution Holocene palaeoclimate reconstruction

Roop, Heidi A., Dunbar, Gavin B., Levy, Richard, Vandergoes, Marcus J., Forrest, Alexander L., Walker, Sharon L., Purdie, Jennifer, Upton, Phaedra, and Whinney, James (2015) Seasonal controls on sediment transport and deposition in Lake Ohau, South Island, New Zealand: implications for a high-resolution Holocene palaeoclimate reconstruction. Sedimentology, 62 (3). pp. 826-844.

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Abstract

Laminated sediments in Lake Ohau, Mackenzie Basin, New Zealand, offer a potential high-resolution climate record for the past 17 kyr. Such records are particularly important due to the relative paucity of detailed palaeoclimate data from the Southern Hemisphere mid-latitudes. This paper presents outcomes of a study of the sedimentation processes of this temperate lake setting. Hydrometeorological, limnological and sedimentological data were collected over a 14 month period between 2011 and 2013. These data indicate that seasonality in the hydrometeorological system in combination with internal lake dynamics drives a distinct seasonal pattern of sediment dispersal and deposition on a basin-wide scale. Sedimentary layers that accumulate proximal to the lake inflow at the northern end of the lake form in response to discrete inflow events throughout the year and display an event stratigraphy. In contrast, seasonal change in the lake system controls accumulation of light (winter) and dark (summer) laminations at the distal end of the lake, resulting in the preservation of varves. This study documents the key processes influencing sediment deposition throughout Lake Ohau and provides fundamental data for generating a high-resolution palaeoclimate record from this temperate lake.

Item ID: 41773
Item Type: Article (Refereed Research - C1)
Keywords: grain size, modern process, palaeoclimate, sediment deposition, varves
ISSN: 1365-3091
Funders: GNS Science Global Change through Time, Sarah Beanland Memorial Scholarship, ANZICE, PMEL, Eggers fund
Projects and Grants: ANZICE program (VICX0704), PMEL Contribution Number 4122
Date Deposited: 08 Dec 2015 15:53
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 100%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 100%
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