몬순이 만들어낸 일본의 돗토리 사구(출처 Quaternary International)

정식 제목은

 

Late Holocene aeolian sedimentation in the Tottori coastal dune field, affected by the East Asian winter monsoon

 

Quaternary International (4기연구 저널)

doi:10.1016/j.quaint.2015.09.062

도토리 사구.pdf

 

 

우리나라 서해안의 해안사구를 다룬 또 다른 비교 논문

해안사구의 물질 구성과 플라이스토세층(강대균).pdf

 

 

 

 

 

Abstract

 

Many dune fields that have formed along the southern coast of the Japan Sea (이런 썩을) are influenced by the north-westerly winter monsoon, which transports beach sand landwards.

 

The Tottori coastal dune field of the Japan Sea has not been disturbed much by human activities until the 20th century and thus is expected to provide a continuous record of the relationships between the winter monsoon and aeolian sedimentation.

 

We examined new ground-penetrating radar profiles and optically stimulated luminescence (OSL) ages of quartz sand from transverse dune ridges in the western part of the dune field in addition to existing data in the eastern part.

 

This allowed us to extend the study period to cover the past 1000 years and to effectively compare the sedimentary record with other coastal dune fields in East Asia and other palaeoenvironmental proxies.

 

OSL ages from older dune sediments suggest considerable aeolian activity from the 10th to 12th century AD, whereas a hiatus of dune sediment record between the 12th and 15th centuries was detected.

 

These results suggest that during the Medieval period aeolian activity was low or that extensive erosion removed most of the deposits.

 

Since the late 15th century, dune sedimentation has apparently been broadly continuous, though with periods of higher and lower activity.

 

In both of the eastern and western parts, most of the dune ridges accreted landwards, but clear seaward accretion occurred during the 18th century, possibly reflecting a decrease in wind strength that restricted sand transport. In contrast, two significant landward accretion events are inferred to have occurred from the late 15th to 17th centuries and around 1840, corresponding to periods of increased dust fall in China, which suggests an enhanced winter monsoon, and to cold periods suggested by the decline of the sunspot number. 

 

The timing of periods of inactive and active dune sedimentation, inferred from alternations of organic soil and aeolian sand, in other coastal dune fields of East Asia appears to be concordant with corresponding periods in the Tottori dune field.

 

We thus propose that other Japan Sea dune fields may also provide a valuable record of East Asian winter monsoon fluctuations

 

 

현 생 누 대	신 생 대	신신생기 (네오기)	홀로세
			플라이스토세
			플리오세
			마이오세
		고신생기 (팔레오기)	올리고세
			에오세
			팔레오세
	▼	▼	▼

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 1. Map of East Asia and the modern winter monsoon system. Arrows show the surface wind pattern in winter after Wang et al. (2005).

 

 

 

Fig. 2.
A) ALOS satellite image of the Tottori coast acquired in 2006.
B) Aerial photograph of the Tottori dune field taken in 2006 (photo courtesy of the Committee of Tottori Dune
Recovery). From left to right Transects TTD05, TTD01, and TTD02 are shown.
C) Topography of the Tottori dune field, surveyed in 1973 (from the 1:25000 map “Tottori-Hokubu”,
compiled by the Geographical Institution of Japan). The shoreline position has been updated to reflect the latest map. Exposures of the palaeosol covering the Pleistocene dune are shown following Enomoto et al. (2006).
D) Annual sand flow regime in the Tottori dune field based on wind gauge measurements in 2009..

 

 

 

Fig. 3. Line drawings of the GPR profiles along transects A) TTD01 and B) TTD02 showing OSL dating results reported by Tamura et al. (2011a,b). The sea is to the right. Transect positions are shown in 'Fig. 2'C. P= ¼ position of borehole. OSL ages with standard errors exceeding 10 years have been rounded to the nearest decade.

 

 

 

 

 

 

Fig. 4. A) Ground-penetrating radar profile, B) line drawing, and C) definition of the sedimentary units along transect TTD05. Borehole positions, OSL dating results, and shoreline positions in 1932 and 1973 are also shown. The sea is to the right. Transect position is shown in 'Fig. 2' C. P=¼ position of borehole. OSL ages with standard errors exceeding 10 years are rounded to the nearest decade.

 

 

 

 

 

 

 

Fig. 5. A) Ground-penetrating radar profile, B) line drawing, and C) definition of sedimentary units along transect TTD06. Borehole positions and OSL dating results are also shown. The sea is to the right. The transect position is shown in 'Fig. 2'C.P= ¼ position of borehole. OSL ages with standard errors exceeding 10 years are rounded to the nearest decade.

 

 

 

 

Fig. 6. A) Ground-penetrating radar profile, B) line drawing, and C) definition of sedimentary units along transect TTD07. Borehole positions, OSL dating results, and shoreline positions in 1932 and 1973 are also shown. The sea is to the right. Transect position is shown in 'Fig. 2'C. P= ¼ position of borehole. OSL ages with standard errors exceeding 10 years are rounded to the nearest decade.