Dendroclimatic Signals in Long Tree-Ring Chronologies from the Himalayas of Nepal

Eagle over Nepal; Site Location Map Dendroclimatic Signals in Long Tree-Ring Chronologies from the Himalayas of Nepal
International Journal of Climatology , v. 23, Issue 7, 707-732, 15 June 2003.

Edward R. Cook and Paul J. Krusic
Tree-Ring Laboratory Lamont-Doherty Earth Observatory
Phillip D. Jones
Climatic Research Unit University of East Anglia
ABSTRACT:
We describe the development of a tree-ring chronology network in Nepal that is suitable for reconstructing temperature-related climate forcing over the past few hundred years. The network is composed of 32 tree-ring chronologies and is represented by five indigenous tree species. An empirical orthogonal function analysis of the chronologies over the common interval 1796-92 indicates the existence of coherent large-scale signals among the tree-ring chronologies that are hypothesized to reflect, in part, broad-scale climate forcing related to temperatures. A long monthly temperature record for Kathmandu is developed and used to test this hypothesis. In so doing, significant monthly and seasonal temperature responses are identified that provide guidance for the formal reconstruction of two temperature seasons: February-June (1546-91) and October-February (1605-91). Each reconstruction indicates the occurrence of unusually cold temperatures in 1815-22, which coincides with the eruption of Tambora in Indonesia. A novel method is also used to add probable missing multi-centennial temperature variance to each reconstruction. The resulting adjusted reconstructions strongly reflect patterns of temperature variability associated with Little Ice Age cooling and warming into the 20th century, with the October-February season exhibiting the strongest increase in temperature over the past 400 years. Only the October-February season shows any evidence for late- 20th century warming, whereas February-June temperatures have actually cooled since 1960 (as with the observational series).

Kathmandu Temperature Reconstructions

Download Data from the WDC Paleo archive:
Kathmandu Temperature Reconstructions including pre-monsoon (February-June, 1546-1991) and post-monsoon (October-February 1605-1991) temperature reconstructions plus Kathmandu Extended Precipitation and Temperature Record at the Indian Embassy.

Kathmandu Precipitation Record

Tree Ring Data:
Click each site name to download tree ring measurements data from the
International Tree Ring Data Bank at the WDC Paleo

Name

ID

Species

Lat.

Long.

Elev.m.

FYOD

LYOD

Age

GurchieLehk

GLAS

Abies spectabilus

29.500

82.000

3330

1530

1997

468

KatyaKhola

KY2AS

Abies spectabilus

29.500

82.010

3330

1602

1997

396

AboveGheri

AGAS

Abies spectabilus

29.480

82.080

3450

1530

1997

468

GurchieLehk-ZU

GLZAS

Abies spectabilus

29.500

82.080

3450

1741

1979

239

PunHill

PHAS

Abies spectabilus

28.531

83.696

2950

1872

1993

122

Deorali-TRL/ZU

DLAS

Abies spectabilus

28.554

83.732

1830

1395

1997

603

Marsyangdi-ZU

MAAS

Abies spectabilus

28.580

84.250

2900

1590

1979

390

Banal-TRL/ZU

BNAS

Abies spectabilus

28.040

85.100

3116

1726

1996

271

ChardungDanda

CDAS

Abies spectabilus

27.677

86.259

3000

1546

1998

453

Chardung

CHAS

Abies spectabilus

27.696

86.271

3300

1689

1998

310

DobiniDanda

DDAS

Abies spectabilus

27.722

86.330

3500

1754

1998

245

BhulePokari

BHAS

Abies spectabilus

27.672

86.415

3600

1625

1998

374

Kaligchok-ZU

KAAS

Abies spectabilus

27.750

86.600

3720

1725

1978

254

Lamjura-ZU

LAAS

Abies spectabilus

27.580

86.880

3020

1800

1979

180

NeheKarka

NKAS

Abies spectabilus

27.772

87.148

3250

1672

1996

325

KaumaKarka

KKAS

Abies spectabilus

27.654

87.150

2900

1712

1993

282

RachelsDeath

RDAS

Abies spectabilus

27.736

87.190

3630

1509

1996

488

Mumbuk

MUAS

Abies spectabilus

27.703

87.211

3200

1546

1996

451

Budorouk

BRAS

Abies spectabilus

27.750

87.283

2970

1683

1996

314

LaminteBhajyang

LBAS

Abies spectabilus

27.510

87.910

3276

1561

1999

439

Ghunsa

GHAS

Abies spectabilus

27.635

87.940

3740

1525

1999

475

DobiniDanda

DDJS

Juniperus recurva

27.724

86.331

3500

1445

1998

554

BhulePokari

BHJS

Juniperus recurva

27.667

86.405

3600

1417

1998

582

Bagarchap

BCPC

Populus ciliata

28.530

84.328

2270

1824

1994

171

TilaNala-ZU

TNPR

Pinus roxburghii

29.080

81.830

2080

1650

1979

330

Nargarjun-TRL/ZU

NGPR

Pinus roxburghii

27.750

85.250

1420

1878

1996

119

Bhaktapur-TRL/ZU

BTPR

Pinus roxburghii

27.660

85.400

1320

1880

1996

117

KatyaKhola

KY3PS

Picea smithiana

29.500

82.030

3480

1671

1997

327

RarGoan-ZU

RGPS

Picea smithiana

29.580

82.083

3000

1655

1979

325

Alubari

ABPW

Pinus wallichiana

28.760

83.656

3000

1803

1993

191

Bhratang

BTPW

Pinus wallichiana

28.590

84.184

3095

1796

1994

199

Deorali

DLTD

Tsuga dumosa

28.554

83.732

1830

1727

1997

271

Sanu-TRL/ZU

SATD

Tsuga dumosa

28.040

85.000

2910

1605

1996

392

Langtang-TRL/ZU

LTTD

Tsuga dumosa

28.183

85.430

2670

1559

1994

436

Tragdobuk-TRL/ZU

TRTD

Tsuga dumosa

27.57

86.570

2950

1612

1994

383

LukuchiKhola

LKTD

Tsuga dumosa

27.772

87.260

2880

856

1996

1141

Budorouk

BRTD

Tsuga dumosa

27.750

87.283

2970

1681

1996

316

AboveHatiya

AHTD

Tsuga dumosa

27.743

87.299

2940

1702

1996

295

YalungTRL/NK

YKTD

Tsuga dumosa

27.505

87.900

3033

1500

1999

500

KatyaKhola

KYUW

Ulmnus wallichiana

29.510

82.030

2760

1566

1997

432

To read or view the full study, please visit the Wiley InterScience website.
It was published in International Journal of Climatology, v. 23, Issue 7, pp. 707-732, 15 June 2003.

Contact Us
National Oceanic and Atmospheric Administration
9 June 2003