 |
| Titel |
Reconstruction of the March-August PDSI since 1703 AD based on tree rings of Chinese pine (Pinus tabulaeformis Carr.) in the Lingkong Mountain, southeast Chinese loess Plateau |
| VerfasserIn |
Q. Cai, Y. Liu, Y. Lei, G. Bao, B. Sun |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 2 ; Nr. 10, no. 2 (2014-03-13), S.509-521 |
| Datensatznummer |
250116935
|
| Publikation (Nr.) |
 copernicus.org/cp-10-509-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| We utilised tree-ring cores, collected from three sites at Lingkong Mountain
located in the southeast part of the Chinese Loess Plateau (CLP), to develope
a regional ring-width chronology. Significant positive correlations between
the tree-ring index and the monthly Palmer drought severity index (PDSI)
were identified, indicating that the radial growth of trees in this region
was moisture-limited. The March–August mean PDSI was quantitatively
reconstructed from 1703 to 2008 with an explained variance of 46.4%.
Seven dry periods during 1719–1726, 1742–1748, 1771–1778, 1807–1818,
1832–1848, 1867–1932 and 1993–2008 and six wet periods during 1727–1741,
1751–1757, 1779–1787, 1797–1805, 1853–1864 and 1934–1957 were revealed
in our reconstruction. Among them, 1867–1932 and 1934–1957 were identified
as the longest dry and wet periods, respectively. On the centennial scale,
the 19th century was recognised as the driest century. The drying tendency
since 1960s was evident. However, recent drought in 1993–2008 was still
within the frame of natural climate variability based on the 306 yr PDSI
reconstruction. The dry and wet phases of Lingkong Mountain were in
accordance with changes in the summer Asian-Pacific oscillation (IAPO)
and sunspot numbers, they also showed strong similarity to other tree-ring
based moisture indexes in large areas in and around the CLP, indicating the
moisture variability in the CLP was almost synchronous and closely related
with large-scale land–ocean–atmospheric circulation and solar activity.
Spatial correlation analysis suggested that this PDSI reconstruction could
represent the moisture variations for most parts of the CLP, and even larger
area of northern China and east Mongolia. Multi-taper spectral analysis
revealed significant cycles at the inter-annual (2–7 yr), inter-decadal
(37.9 yr) and centennial (102 yr) scales. Results of this study are very
helpful for us to improve the knowledge of past climate change in the CLP
and enable us to prevent and manage future natural disasters. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|