The microclimate within a Neolithic passage grave

Poul Klenz Larsen, Lars Aasbjerg Jensen, Morten Ryhl-Svendsen, Tim Padfield

Publikation: Bidrag til bog/antologi/rapportKonferencebidrag i proceedingsForskningpeer review

Resumé

Microclimate measurements in a Neolithic passage grave in Denmark have shown that natural ventilation through the open entrance destabilizes the relative humidity (RH), whereas a
sealed entrance gives a much more stable RH, above 90%. Episodes of condensation occur on the stone surfaces in summer with too much ventilation and in winter with too little
ventilation. Soil moisture measurements above, below, and beside the grave mound indicate that rainfall on the mound is not a significant source of moisture to the chamber, whereas the ground below the sealed chamber is constantly moist. The chamber can be kept dry all year by putting a moisture barrier membrane over the floor. Apart from the more variable climate within the open chamber, there is also a significant penetration of ozone, which is absent in the sealed chamber. The ozone may have deteriorated the folds of birch bark put between the horizontal sandstone slabs within the chamber. The damage is supposed to have happened when the chamber was left open during the last 200 years. Visitors touching the fragile bark
may be another cause of damage. Keeping the entrance closed seems to be the best solution for preserving the remaining birch bark.
Microclimate measurements in a Neolithic passage grave in Denmark have shown that natural ventilation through the open entrance destabilizes the relative humidity (RH), whereas a
sealed entrance gives a much more stable RH, above 90%. Episodes of condensation occur on the stone surfaces in summer with too much ventilation and in winter with too little
ventilation. Soil moisture measurements above, below, and beside the grave mound indicate that rainfall on the mound is not a significant source of moisture to the chamber, whereas the ground below the sealed chamber is constantly moist. The chamber can be kept dry all year by putting a moisture barrier membrane over the floor. Apart from the more variable climate within the open chamber, there is also a significant penetration of ozone, which is absent in the sealed chamber. The ozone may have deteriorated the folds of birch bark put between the horizontal sandstone slabs within the chamber. The damage is supposed to have happened when the chamber was left open during the last 200 years. Visitors touching the fragile bark
may be another cause of damage. Keeping the entrance closed seems to be the best solution for preserving the remaining birch bark.
SprogEngelsk
TitelICOM-CC 18th Triennial Conference Preprints : Copenhagen, 4–8 September 2017
RedaktørerJanet Bridgland
Antal sider9
Udgivelses stedParis
ForlagICOM-CC, International Committee of Museums
Dato4 sep. 2017
Sider1-9
Artikelnummer1512
ISBN (Elektronisk)978-92-9012-426-9
StatusUdgivet - 4 sep. 2017
BegivenhedICOM-CC 18th Triennial Conference: Linking Past and Future - International Council of Museums - Conservation Committee, Copenhagen, Danmark
Varighed: 4 sep. 20178 sep. 2017
Konferencens nummer: 18
http://www.icom-cc2017.org/

Konference

KonferenceICOM-CC 18th Triennial Conference
Nummer18
LokationInternational Council of Museums - Conservation Committee
LandDanmark
ByCopenhagen
Periode04/09/201708/09/2017
Internetadresse

Emneord

  • passage grave
  • birch bark
  • microclimate
  • condensation
  • ozone

Kunstnerisk udviklingsvirksomhed (KUV)

  • Nej

Citer dette

Klenz Larsen, P., Aasbjerg Jensen, L., Ryhl-Svendsen, M., & Padfield, T. (2017). The microclimate within a Neolithic passage grave. I J. Bridgland (red.), ICOM-CC 18th Triennial Conference Preprints: Copenhagen, 4–8 September 2017 (s. 1-9). [1512] Paris: ICOM-CC, International Committee of Museums.
Klenz Larsen, Poul ; Aasbjerg Jensen, Lars ; Ryhl-Svendsen, Morten ; Padfield, Tim. / The microclimate within a Neolithic passage grave. ICOM-CC 18th Triennial Conference Preprints: Copenhagen, 4–8 September 2017. red. / Janet Bridgland. Paris : ICOM-CC, International Committee of Museums, 2017. s. 1-9
@inproceedings{f7e45b2e976141b3b2b6df9cb378e79f,
title = "The microclimate within a Neolithic passage grave",
abstract = "Microclimate measurements in a Neolithic passage grave in Denmark have shown that natural ventilation through the open entrance destabilizes the relative humidity (RH), whereas asealed entrance gives a much more stable RH, above 90{\%}. Episodes of condensation occur on the stone surfaces in summer with too much ventilation and in winter with too little ventilation. Soil moisture measurements above, below, and beside the grave mound indicate that rainfall on the mound is not a significant source of moisture to the chamber, whereas the ground below the sealed chamber is constantly moist. The chamber can be kept dry all year by putting a moisture barrier membrane over the floor. Apart from the more variable climate within the open chamber, there is also a significant penetration of ozone, which is absent in the sealed chamber. The ozone may have deteriorated the folds of birch bark put between the horizontal sandstone slabs within the chamber. The damage is supposed to have happened when the chamber was left open during the last 200 years. Visitors touching the fragile barkmay be another cause of damage. Keeping the entrance closed seems to be the best solution for preserving the remaining birch bark.",
keywords = "passage grave, birch bark, microclimate, condensation, ozone",
author = "{Klenz Larsen}, Poul and {Aasbjerg Jensen}, Lars and Morten Ryhl-Svendsen and Tim Padfield",
year = "2017",
month = "9",
day = "4",
language = "English",
pages = "1--9",
editor = "Janet Bridgland",
booktitle = "ICOM-CC 18th Triennial Conference Preprints",
publisher = "ICOM-CC, International Committee of Museums",

}

Klenz Larsen, P, Aasbjerg Jensen, L, Ryhl-Svendsen, M & Padfield, T 2017, The microclimate within a Neolithic passage grave. i J Bridgland (red.), ICOM-CC 18th Triennial Conference Preprints: Copenhagen, 4–8 September 2017., 1512, ICOM-CC, International Committee of Museums, Paris, s. 1-9, ICOM-CC 18th Triennial Conference, Copenhagen, Danmark, 04/09/2017.

The microclimate within a Neolithic passage grave. / Klenz Larsen, Poul; Aasbjerg Jensen, Lars; Ryhl-Svendsen, Morten; Padfield, Tim.

ICOM-CC 18th Triennial Conference Preprints: Copenhagen, 4–8 September 2017. red. / Janet Bridgland. Paris : ICOM-CC, International Committee of Museums, 2017. s. 1-9 1512.

Publikation: Bidrag til bog/antologi/rapportKonferencebidrag i proceedingsForskningpeer review

TY - GEN

T1 - The microclimate within a Neolithic passage grave

AU - Klenz Larsen,Poul

AU - Aasbjerg Jensen,Lars

AU - Ryhl-Svendsen,Morten

AU - Padfield,Tim

PY - 2017/9/4

Y1 - 2017/9/4

N2 - Microclimate measurements in a Neolithic passage grave in Denmark have shown that natural ventilation through the open entrance destabilizes the relative humidity (RH), whereas asealed entrance gives a much more stable RH, above 90%. Episodes of condensation occur on the stone surfaces in summer with too much ventilation and in winter with too little ventilation. Soil moisture measurements above, below, and beside the grave mound indicate that rainfall on the mound is not a significant source of moisture to the chamber, whereas the ground below the sealed chamber is constantly moist. The chamber can be kept dry all year by putting a moisture barrier membrane over the floor. Apart from the more variable climate within the open chamber, there is also a significant penetration of ozone, which is absent in the sealed chamber. The ozone may have deteriorated the folds of birch bark put between the horizontal sandstone slabs within the chamber. The damage is supposed to have happened when the chamber was left open during the last 200 years. Visitors touching the fragile barkmay be another cause of damage. Keeping the entrance closed seems to be the best solution for preserving the remaining birch bark.

AB - Microclimate measurements in a Neolithic passage grave in Denmark have shown that natural ventilation through the open entrance destabilizes the relative humidity (RH), whereas asealed entrance gives a much more stable RH, above 90%. Episodes of condensation occur on the stone surfaces in summer with too much ventilation and in winter with too little ventilation. Soil moisture measurements above, below, and beside the grave mound indicate that rainfall on the mound is not a significant source of moisture to the chamber, whereas the ground below the sealed chamber is constantly moist. The chamber can be kept dry all year by putting a moisture barrier membrane over the floor. Apart from the more variable climate within the open chamber, there is also a significant penetration of ozone, which is absent in the sealed chamber. The ozone may have deteriorated the folds of birch bark put between the horizontal sandstone slabs within the chamber. The damage is supposed to have happened when the chamber was left open during the last 200 years. Visitors touching the fragile barkmay be another cause of damage. Keeping the entrance closed seems to be the best solution for preserving the remaining birch bark.

KW - passage grave

KW - birch bark

KW - microclimate

KW - condensation

KW - ozone

M3 - Article in proceedings

SP - 1

EP - 9

BT - ICOM-CC 18th Triennial Conference Preprints

PB - ICOM-CC, International Committee of Museums

CY - Paris

ER -

Klenz Larsen P, Aasbjerg Jensen L, Ryhl-Svendsen M, Padfield T. The microclimate within a Neolithic passage grave. I Bridgland J, red., ICOM-CC 18th Triennial Conference Preprints: Copenhagen, 4–8 September 2017. Paris: ICOM-CC, International Committee of Museums. 2017. s. 1-9. 1512.