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Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus

ANOVA results (room 2): interaction plot. Plot showing the effect of year (2008: blue squares; 2010: red circles) and data-logger on the daily mean temperatures (a) and RH (b) recorded in room 2 from 14th to 31st of August. Codes indicate the wall orientation (North, South, East or West) and the height (u: upper position; i: intermediate; f: floor level). For each data-logger, the average and 95% LSD interval is illustrated.
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Figure 6: ANOVA results (room 2): interaction plot. Plot showing the effect of year (2008: blue squares; 2010: red circles) and data-logger on the daily mean temperatures (a) and RH (b) recorded in room 2 from 14th to 31st of August. Codes indicate the wall orientation (North, South, East or West) and the height (u: upper position; i: intermediate; f: floor level). For each data-logger, the average and 95% LSD interval is illustrated.

Mentions: An effect of sensor height in room 2 is reflected by Figure 6a. Floor probes recorded lower temperatures with a similar mean in both years. By contrast, probes at the upper position (#17 - #20) registered higher values in 2008 due to the effect of solar radiation incident on the upper parts of walls before the roof change. The observed differences are statistically significant (α=0.05) because the LSD (Least Significant Difference) intervals do not overlap. The pattern of temperature according to sensor height is inversely related to the pattern of RH (Figure 6b) because higher temperatures imply lower RH and vice-versa. The observed differences of RH according to year are also statistically significant. Such clear effect of sensor height on thermohygrometric parameters is not so apparent in the other lodgings probably because room 2 is the only one delimited by four walls, which provides more stable conditions.


Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

ANOVA results (room 2): interaction plot. Plot showing the effect of year (2008: blue squares; 2010: red circles) and data-logger on the daily mean temperatures (a) and RH (b) recorded in room 2 from 14th to 31st of August. Codes indicate the wall orientation (North, South, East or West) and the height (u: upper position; i: intermediate; f: floor level). For each data-logger, the average and 95% LSD interval is illustrated.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3672094&req=5

Figure 6: ANOVA results (room 2): interaction plot. Plot showing the effect of year (2008: blue squares; 2010: red circles) and data-logger on the daily mean temperatures (a) and RH (b) recorded in room 2 from 14th to 31st of August. Codes indicate the wall orientation (North, South, East or West) and the height (u: upper position; i: intermediate; f: floor level). For each data-logger, the average and 95% LSD interval is illustrated.
Mentions: An effect of sensor height in room 2 is reflected by Figure 6a. Floor probes recorded lower temperatures with a similar mean in both years. By contrast, probes at the upper position (#17 - #20) registered higher values in 2008 due to the effect of solar radiation incident on the upper parts of walls before the roof change. The observed differences are statistically significant (α=0.05) because the LSD (Least Significant Difference) intervals do not overlap. The pattern of temperature according to sensor height is inversely related to the pattern of RH (Figure 6b) because higher temperatures imply lower RH and vice-versa. The observed differences of RH according to year are also statistically significant. Such clear effect of sensor height on thermohygrometric parameters is not so apparent in the other lodgings probably because room 2 is the only one delimited by four walls, which provides more stable conditions.

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus